Posts Tagged ‘coloured glass’

THE JUDGMENT OF PARIS
Nevers, Prance, 1777. Hi. 210 mm (8-25 in.)
Verre de Nevers: This technique origin-
ated in Nevers in the late 16th century, and
it is more closely allied to lamp-working
than to the normal techniques used for
creating glass objects, such as blowing and
moulding. It flourished in Europe for
some two centuries. This delightful group,
depicting the judgment of Paris, was made
in Nevers in the heyday of the glass
figurine, between the late 17th and early
18th centuries. The figures were made by
softening rods of glass of different colours
and winding them over a metal armature.
Every fold of the garments on this group
has a metal base below the glass. When the
glass was sufficiently thick, and after
repeated reheating, it was modelled to
shape with the aid of prods and pinchers. I n
Verre de Nevers groups, decorative details
such as leaves are made entirely of glass,
with no supporting core, while such forms
as birds might be blown.
WINE-GLASS WITH LAMP-WORKED DECORATION
Saxony? early 18th century. 111. 140 mm (55 in.)
Lamp-working is a technique used by
glass-makers to make objects by using only
a single flame as a source of heat. Glass
rods are normally used, held over the
flame and melted or softened to the
desired shape. In modern times, the most
popular lamp-worked objects are small
animals made out of coloured glass rods
melted down, bent and joined to the
required form. Details like eyes are made
by putting a small drop of molten glass on
the object, with possibly another centred
on the first drop to form the pupil. The
ornate stem-work on Venetian and /aeon
de Venise wine-glasses is closely allied to
this technique. One of the rare instances of
true lamp-working on a blown glass is the
wine-glass illustrated, which is one of a
series that have a band of lamp-worked
decoration round the centre of the bowl.
The work stands out in three dimensions
from the bowl, the small Cupid being
almost free-standing; he holds a garnet in
his hand. The provenance of these vessels
is not certain.
TULIP-SHAPED JUG
Karl Kopping, Berlin, c. 1900
I It. .120 mm (126 in.)
Karl Kopping (1848-1914) was a painter
and etcher in Berlin. Between 1892 and
1900 he designed some tall decanters and
goblets made at the lamp from tube glass.
At that time Germany had lor some ten
years been under the influence of the style
for naturalism created by Emile Galle of
France. It became known in Germany as
the Jugendsttl, and Karl Kopping’s exag-
gerated Art Nouveau glass vessels form a
part of this movement. The starting point
for his designs was the flower on its stalk,
and the colours he used could be both bold
and delicate. The stem of the glass
illustrated is in blue, the leaves are in
copper-green glass and the tulip-shaped
bowl has a metallic finish. The piece is
signed on the foot: ‘C. Kopping’. 1 lis work
became popular, and several museums
bought examples of it, but today they are
regarded more as period pieces.
BIRD FOUNTAIN
England, it»th century. III. 4H9 mm (1925 in.)
(See also colour photograph 16))
It has always been the custom for glass-
blowers to amuse themselves in spare
moments by creating fantasies in glass.
These are known in the trade as ‘friggcrs’
—a word which possibly derives from the
Old English ‘Jrician’, to dance. In Scotland
they are called ‘whigmelccrics’. In the
19th and early 20th centuries friggcrs
included elaborate fountains surrounded
by birds with tails of glass fibres and fully
rigged sailing ships on spun glass seas, as
well as the objects mentioned on page 100.
The more elaborate friggcrs are usually
protected by a large glass dome. Friggers
were made for amusement, for family
presents, as an extra source of money, or
even for fully mercantile reasons. Travel-
ling glass-makers who visited fairs and
private houses produced many of these
novelties, having as their kit a bundle of
multi-coloured glass canes and a little
furnace heated by a tallow flame.
The ‘taking away’ or abrasive techniques of
glass-making have as long a history as glass
itself Even earlier, hieroglyphic inscriptions
had been engraved on hard stone vessels, and
we definitely know that as early as the 16th
century B.C. glass was being engraved in
Egypt. Most of this engraving was probably
done with pointed instruments or possibly
with a rotary wheel. Wheel-culling and
wheel-engraving are the two terms most
commonly encountered, and though they are
thought of as almost separate methods,
basically the techniques are the same. In
both, a rotating abrasive wheel cuts into the
glass surface. The mam distinction is that
large wheels are used for cutting, where the
worker holds the glass on lop oj the wheel,
between himself and his tool; and small ones
for engraving, where he holds it below the
wheel, so that he can see what he is doing.
Culling is characterised by large-scale,
geometric designs, usually relatively deeply
incised, and engraving by jine, detailed,
usually pictorial work.
Grinding and Cutting from a Raw Block of
Glass: This was the only ‘taking away’
technique that was used to produce a com-
plete vessel or other object. The method,
which was covered in the first chapter,
dealing with techniques before blowing
was invented, continued in use for a short
time after the 1st century B.C. The ring
illustrated is a good example of the method
used to produce a single decorative object.
One might imagine that a gem or even a
glass cameo was once set in the concavity
left by the glass-cutter at the front of the
ring. (lasting glass in moulds and blowing
glass were so much easier, that this tech-
nique, using rotary abrasion to shape an
object, fell into disfavour. It was con-
tinued primarily as a means of finishing off
already made glass forms, or as a means of
embellishment.
GOBLET BEARING THE NAME OF TUTHMOSIS III
(1504 1450 B.C.)
Egypt III. 130 mm (5-1 in.)
Early Wheel Engraving: The goblet illus-
trated, made of turquoise-blue opaque
glass with a gold ring at the rim and base,
is a famous example of early incised work.
Some glass vessels from the 18th Dynasty
in Egypt are decorated with incised
inscriptions such as that found by Sir
flinders Petrie at Tell el Amarna. A frag-
ment of a bowl at The Corning Museum of
C1 hiss bears a fragmentary inscription
relating to the wife of Amcnhotep III
(1412 1375 B.C.), and is said to reveal ‘the
characteristic tapering ends of wheel cuts’.
Whether the engraving on these early
vessels was done with a point or by means
of a rotating instrument has been tho-
roughly discussed by R. J. Charleston (see
Bibliography). For the most part it seems
that just a pointed instrument was used,
and it was only in the later Egyptian
period that there is evidence of wheel-
engraving on the glass, probably by the use
of a bow-lathe.
SHALLOW BOWL WITH PETAL DESIGN
Roman Empire, 7ih 5th century B.C.
Hi. 39 mm (155 in), diam. 174 mm (685 in.)
In the general Mesopotamia-Assyria-Asia-
Minor region, rotary abrasion was used to
sharpen up decorative motifs, which were
first produced by moulding processes.
There is a large family of bowls with
radiating petal motifs—one being illus-
trated here—the earliest of which is known
to date from not later than 700 B.C. These
were produced by being cast into moulds,
and finished by grinding and cutting. As
abrasive powder on the wheels, emery was
probably used; this was apparently known
in Egypt at least as early as the 18th
Dynasty. The known use by the Egyptians
of tubular metal drills in cutting granite
was probably paralleled further East in the
first millenium B.C. Some such means
must have been employed in the hollowing
out of vessels like the famous ‘Sargon vase’
(see first chapter).
It is not known what type of abrading
equipment was used in Roman times to
decorate glass. It has been suggested that
an all-purpose tool could have been used,
which could be adapted as lathe, drill or
engraving wheel as needed. The Romans
definitely used abrasives such as emery for
cutting, and pumice stone for polishing the
cuts. Probably from Egypt came a group
of facet-cut and ‘diamond’-point engraved
bowls from the ist and 2nd century A.D.
(See Diamond-Point Engraving.) These
are the parent group from which are
descended all late Roman cut and engraved
glasses with figured scenes. The quality of
Alexandrian engraved work deteriorated
during the 3rd and 4th centuries A.D.
However, in the west, from some time in
the 3rd century A.D. onwards, a great
quantity of figured cut or engraved glass
began to be produced in Italy and the
neighbouring provinces, of which the dish
illustrated above is an example.
Figured decoration in engraved work was
not altogether abandoned by workers in
the eastern workshops, as is seen in some
later exports to the west from the east.
However, in general they began to con-
centrate on easier designs, suited to less
skilful engravers, and presumably for more
speedy production. The jug illustrated,
with geometric decoration in friezes, is an
example of the rather rough designs the
West Syrian/Egyptian workshops fav-
oured. It is in dark yellowish-green glass,
which is of rather poor quality, being
bubbly and streaky with impurities. The
fine linear and facet cutting of the earlier
period is not in evidence. Wheel-engraving
was now used to imitate facet cutting, with
designs of curved lines, circles and ovals.
The style took particular root in Egypt,
and probably in Syria also. Many of the
vessels of this type found in the west must
have been imports from these areas.
Diatreta are the most extraordinary and
most outstanding examples of the tech-
nique of abrasion ever made. From experi-
ments carried out by Fritz W. Schafer in
Germany and Barbini and Fuga in Italy it
has been proved with almost complete
certainty that these delicate cage cups were
produced by lapidary means, and not by
any other technique (see Bibliography). A
small battery of wheels and readily avail-
able abrasives, plus the skill of the en-
graver, are all that is needed to make a
diairelum from a solid, carefully annealed
blank. Diatreta are the finest product of
the Cologne and Trier glass-makers in the
4th century A.D. They have been found
in the Rhineland, on the Danube, in
Northern Italy and in Greece. The three
most beautiful, all with inscriptions, came
to light in Cologne. The inscription on the
one illustrated is in Greek, and conveys an
exhortation to drink.
With the decline of the Roman Empire in
the West, glass engraving died out. This
was largely because there was no (ine-
quality glass made after this time that was
suitable for engraving. In the East the
technique never ceased, and glasses with
cut decoration can be traced in unbroken
continuity through Sassanian to Islamic
times. Baghdad and Basra were noted for
cut glass in the 9th century A.D. and later.
In the 9th and ioth cerfturies, after a
renaissance under the dynasty of the
Samanids, a school of relief-cutting flour-
ished in Persia and probably in Meso-
potamia, which in Europe was not rivalled
until the end of the 17th century. The flask
illustrated is an early example of a shape
that was to remain popular throughout the
Islamic period. The scrolling engraved
design was to exert a great influence on the
mind of the Islamic artist.
Hedwigsglas in light brown clear glass, the
gilt-copper foot a later addition
So-called Hedwigsgldser represent the last
wheel-cut glass vessels to be produced in
the Orient, and are recognised as master-
pieces of Egyptian skill. Their origin is by
no means absolutely certain. These thick-
walled glasses carved in hochschnitl (deep
cutting) are maintained by B. Shelkov-
nikov to be the work of a 12th-century
White Russian workshop in Novogrudok,
which was presumably under the influence
of Byzantium. They are certainly a con-
tinuation of the art of rock-crystal cutting,
and more probably originated in Egypt.
The motifs used include stylised lions
and griffins between palm branches, as in
the illustrated example. Two of these
glasses reputedly belonged at one time to
St. Hedwig (1174-1243), wife of the Duke
of Silesia, and it is from her that the glasses
take their name. (Legend has it that the
saint caused water to change into wine in
one of these glasses.) Her niece, St.
Elizabeth (1207-31) also had a Hedwigs-
glas, reputed to give strength to women in
labour, which eventually came into Martin
Luther’s possession.
clp with facet-cltting
Barnwell, Cambridgeshire, England, lasi quarter of
1st century or early 2nd century A.D.
Ht. 90 mm (355 in.)
Facet-Culting is a form of decoration that
goes back certainly to the early Roman
period. Large, broad wheels were needed
to make the facets in the glass. R. J.
Charleston points out that Pliny mentions
some of the abrasives used for grinding in
Roman times, such as ’sand of Naxos’ for
emery, ’sands’ from India, Egypt and
Nubia, and certain stones from Armenia
and Cyprus. He also points out that
Theophrastus mentions pumice and also
emery in his History of Stones. Pliny
mentions Thebaic stone from Egypt and
pumice for the final polishing of marbles.
A wheel with a broad cutting or grinding
edge was certainly used to produce the
facet-cutting on this cup, which is in clear
glass with a greenish tint. Cups like this
found in England and Cyprus are thought
to originate from Western Syria or Egypt
and, in the later 2nd century A.D., from
East Syria.
During the 2nd century A.D. the East
Syrian glass-makers and decorators devel-
oped their knowledge of the art of glass-
engraving including facet-cutting. The
art lived on through Sassanian to Islamic
times. The flask illustrated, in clear glass
with a slight blue tinge, is a typical example
of the continued tradition of wheel-cut
decoration. Oval concave facets cover the
body of the flask, and the neck also has a
ring of facets. Previous to this, in Sassanian
times, wheel-cutting, particularly facet-
cutting, resulted in some striking glass-
ware. Most of the surviving examples from
this period arc cither facet- or linear-cut,
including characteristic shapes such as the
hemispherical bowls with concave cut
facets which were exported to the West
and East, even as far as Japan.
Facet-cutting, particularly for stem-work,
became popular in the second half of the
18th century. Facetted tumblers and
bottles were current in Bohemia, and in
Germany facet-cut knops appear on wine-
glasses from the Laucnstein and other
Hessian glass-houses in the first half of the
18th century. In England at the same time
glass-grinders were facetting the edges of
mirrors, and simple diamond-facetting
was beginning to appear on some glasses.
Scent bottles of opaque white glass and
blue glass, and snuff bottles dating from
about 1770, had all-over facetting and
were often enamelled and gilt. Once
thought to have originated from Bristol,
they more probably came from the Birm-
ingham, South Staffordshire or even Lon-
don area. From the middle of the 18th
century, facet-cutting became an estab-
lished form of decoration in England,
appearing particularly on wine-glass stems,
between c. 1760 to f.1810. Examples can be
found through to the modern period.
VASE WITH FACET CUTTING
By Keith Murray. Stevens & Williams, England,
1939. Ht. 206 mm (8-13 in.)
The architect Keith Murray (b.1893) first
began to take an interest in glass after the
Exhibition in Paris in 1925. He asked
himself why he found the conventional cut
crystal of England so unsatisfactory. After
analysing old English glass, he decided the
glass was better if left plain, or when it was
cut, if the cutting was in a ‘well organised
decoration’, flat cutting being particularly
appealing. The idea of an artist designing
for industry was beginning to be accepted
in England, and in 1932 it was arranged
that Murray should act as designer for
glass for Stevens & Williams at Brierley
Hill, near Stourbridge. During the seven
years he worked in glass he produced
designs for simple unornamented table
services and for some larger pieces. His
most important works are the large vases
and dishes in heavy metal decorated with
facet-cutting reminiscent of early Georgi-
an work. They powerfully express his
architectural feeling, and the decoration
matches the material superbly.
BOWL WITH  FACETTING
By Miluse Roubiekova, Borske sklo, Czechoslovakia,
1958. Diam. 450 mm (17-7 in.)
After the political revolution in Czecho-
slovakia in 1948 the glass industry was
nationalised. The Creative Glass Centre in
Prague was set up in 1952, in order to
establish contact between the glass-works
and the artists and designers, and to
encourage research into new methods of
decorating glass. Czechoslovakian glass
has long been known for its great tradition
in lead crystal cutting, and like its British
counterpart, Bohemian crystal still enjoys
a large public all over the world. The
tradition continues, but finds new expres-
sion in less rigid cut-glass patterns, softer
patterns of a gently formalised character
being increasingly favoured. A good exam-
ple of the new trend is the free irregular
facet-cutting on this bowl designed by
Miluse Roubiekova made at the Borske
sklo, Novy Bor. The usual diamond or
star motifs are no longer in evidence, but
the unsymmetrical lines of the bowl still
enhance the brilliance of the glass.
Later Wheel Engraving: In gem-cutting,
wheels of various materials were certainly
being used by the 15th century to engrave
and polish. By the 16th century, the prin-
ciple of continuous rotary movement had
been established. Engraving equipment
driven by a foot treadle was in use by glass
engravers in the early 17th century. Caspar
I.ehmann, the greatest name in the revival
of glass-engraving in Europe in the late 16th
century, was an engraver of hard-stones
before he was a glass-engraver, and one-
can assume his equipment was more or less
the same for both crafts. Lehmann was
‘Imperial gem-engraver’ to the Emperor
Rudolph II at Prague in 1601, and in 1608
was described as ‘Imperial gem-engraver
and glass-engraver’. From the very begin-
ning, then, the glass-cutter undoubtedly
borrowed his ideas from the gem-cutter,
whose art was so closely allied to his own.
This was a tradition that was to continue
into relatively modern times.
Caspar Lehmann’s engraving is shallow—
because of the thinness of the glass—two-
dimensional and unpolished. Prague was
one of the centres for rock crystal cutting,
and this is reflected in the style of the
engraving, which is flatly cut and gains its
effect from the contrast between the white
engraved lines and the’dark background of
the clear glass. In 1600 I.ehmann obtained
an Imperial Privilege conferring on him
alone the right to practise the art of glass-
engraving in the Imperial domains I le
bequeathed his privilege to his pupil
Gcorg Schwanhardt the Elder, born in
Nuremberg, who worked with him at
Prague. In 1622 Schwanhardt returned to
Nuremberg, where he founded a brilliant
school of wheel-engraving which flourished
to the 18th century. The new potash-lime
glass developed in Bohemia and Germany
in the early 17th century was eminently
suitable for the technique of wheel-
engraving.
COVERED GOBLET IN GREEN GLASS WITH CLEAR GLASS
STEM (DETAIL)
Probably engraved by Hermann Schwinger,
Nuremberg, Germany, about 1665- 80
Hi. 394 mm (15-5 in.)
Schwanhardt’s work in rock crystal and in
glass shows a complete mastery of the
technique of wheel-engraving. His work
was both polished and unpolished, and he
often used as motifs landscapes with
figures, with formal baroque scroll work.
He sometimes added delicate diamond-
point work to his glasses. Among his
pupils were members of his own family,
his sons, Georg the younger and Hcinrich,
and three of his daughters. Other notable
artists among the Nuremberg engravers
were Hermann Schwinger (1640-83) and
Georg Friedrich Killinger (first recorded
1694, died 1726). They all engraved the
same characteristic type of tall goblet,
with hollow knopped stem. The family
of Johann Hess at Frankfort-on-Main
engraved similar glasses in the second half
of the 17th century. Johann Heel (1637-
1709) glass-engraver, silversmith, faience-
painter and engraver of prints in Nurem-
berg also engraved glass in a somewhat
different style, following the motifs he
used in faience painting.
COVERED GOBLET WITH HOCHSCHNITT CUTTING
By Friedrich Winter, Silesia, end of 171I1 century
Ht. 280 mm (11 in.)
{See also colour photograph iH)
During its most flourishing period (c. 1685-
1775) German glass-engraving was done
mainly by unknown artisans working for
themselves in north-eastern Bohemia and
Silesia. However, the best-known work
was done by the engravers to three German
courts. Friedrich Winter set up the first of
these workshops in 1687, with permission
from Count Christoph Leopold von Schaff-
gotsch, at Petersdorf in the Hirschbcrger
Tal. He used water power, and produced
many glasses in the Hochschnitt technique.
Under the patronage of Friedrich Wilhelm,
Elector of Brandenburg, Friedrich Win-
ter’s brother Martin (died 1702) set up an
engraving workshop in Potsdam near
Berlin in 1687. This was also run by a
water-power mill specifically to produce
works in Hochschnitt (deep cutting) and
Tiefschnitt (intaglio work). Martin Win-
ter’s highly gifted nephew Gottfried Spiller
worked here, becoming a partner in 1683.
His engraving included flowers, allegories,
portraits, coats of arms, sometimes in
Hochschnitt, and occasionally he used the
ruby glass of the Potsdam glass-house.

The blank was then subjected to an acid
bath, to give the surface a matt finish.
Knamels were applied somewhat thinly,
except in areas that were to have a raised
design, and these were fired on. The most
popular colours were whiles, tans and soft
pastel shades, though occasionally brighter
colours were employed. The usual floral,
figural, animal, bird and fish motifs of the
Mt. Washington Glass Company were
used on this ware. Ornate handles, finials
and prunts were also to be found. The
initials ‘C apd ‘M’ one upon the other,
with a five-pointed crown above, was the
trademark, though occasionally the crown
was omitted. Thomas Webb & Sons of
Kngland produced a similar ware some
time between 1880 00, as illustrated
above. The New Bedford works may have
produced the so-called ‘Shiny Crown
Milano’, a glossy white opal glass, usually
with gold-coloured floral decoration. It is
found with a red laurel wreath fired to the
bottom of the glass.
In 1870 I lenry Cielhing Richardson of the
firm of Hodgetts, Richardson & Son of
Stourbridge, Kngland, patented a method
for ‘Improvements In Producing Orna-
ments, Designs, And Inscriptions On Or
In Glass’. A wide open-mouthed vessel in
clear glass was made, and when it had
cooled, had a design enamelled on its
inside. The thin-walled vessel was then
heated to a low redness while a second
smaller bubble of opal or other coloured
glass was lowered into it. This was blown
until it attached itself to the inside of the
vessel, thus covering and imprisoning the
enamelled design between the two layers.
The designs were painted so that when the
paraison expanded they did not distort too
much. The same effect could be made by
painting a design in coloured enamels on
an opal or coloured glass and then
immersing this in clear colourless glass to
lock the design in. Once the design was
imprisoned, the glass could be shaped into
the article wanted.
mary gregory vase in green glass with girl and
butter ely net enamelled in white
Atlributcd to Boston & Sandwich Glass Company,
U.S.A., iqth century
So-called ‘Mary Gregory’ glass is a trans-
parent coloured glassware with white or
coloured enamel designs painted and fired
on to the surface. It was a cheap imitation
of English cameo glass, but with a certain
merit of its own. Such wares were made
more prolifically on the Continent than in
America. However, much of the ware has
been erroneously attributed to one of the
older American glass factories in Sand-
wich, Mass., the Boston & Sandwich Glass
Company. The firm is known primarily
for its pressed wares of the early 1830’s,
but later it produced some decorated
glasses, possibly including enamelled glass
of this type. A Mary Gregory is supposed
to have been employed in the decorating
department of the Cape Cod works, which
is the reason for the name given to the
glass. Some genuine Boston & Sandwich
pieces depict young children engaged in
butterfly-collecting, the detail, including
the childrens’ facial features, being beauti-
fully finished.
vase with enamelled decoration
Signed Moser, Bohemia, early 20th century
Ht. 26c mm
Bohemian sources continued to search for
a cheaper method of producing work with
the same surface decorative effect as
English cameo work. They usually
achieved this in Mary Gregory style, with
simulated cameo decoration in extremely
fine white enamel work on overlay vases.
Their work was good, but unfortunately it
depressed the fine English cameo market,
since the genuine cameo work was expen-
sive to produce. In a different category of
enamelling technique comes the work of
Kolo Moser, a Bohemian designer as well
as decorator of glass in the early tooo’s,
who was counted as one of the finer
European glassmen of this period. His
pieces can be recognised by their very fine
enamelling, as in the vase illustrated.
Moser’s work included the introduction to
the market of an amethyst dichroic trans-
parent glass called ‘Alexandria (not to be
confused with the three-coloured ware of
Thomas Webb and Stevens & Williams of
England, which went under the name of
‘Alexandrite’).
VASE WITH ENAMELLED DECORATION
by Maurice Marinoi, France, c. 1920.
Hi. 343 mm (13 50 in.)
Maurice Marinot (born 1882), the most
decisive personality in the history of art
glass between the wars, began as a painter.
Between 1905 and 1914 he was exhibiting
regularly, already showing a tendency for
clear and orderly composition and an
imaginative use of colour. He was intro-
duced to glass-making in 1911, when he
visited the glass factory of Viard near
Troyes, and started to direct the produc-
tion of glass, which he himself decorated
with enamels. His glasses became col-
lectors’ items almost immediately, espec-
ially after his exhibition at the Salon des
link-pendants in 1912. Simple in shape,
they were decorated with the heads and
figures of women. As he began to under-
stand better the technique of enamelling,
his colours became even richer and the
texture finer. The pieces he made after the
First World War showed extraordinary
freedom and refinement, and the colours
had great subtlety, though his pre-war
pieces had a youthful zest which was all
their own.
SPOUTED WINE-GLASS IN CLEAR COLOURLESS GLASS, WITH
GILDING AND PAINTING
Hall-in-ihe-Tyrol, 1536. Ht. 335 mm (1315 in.)
Cold Painted Glass: Unfired colours, such
as lacquer, varnish and oil pigments, have
all been used to decorate glass, but they
easily rub off, and must therefore be con-
sidered a poorer form of coloured decora-
tion than fired enamels. Examples of
Roman glass with unfired paintings have
been found. It is also known that at about
the middle of the 16th century, after
enamelling had gone out of fashion, a form
of decoration in unfired oil colours was in
favour in Italy. Elaborate pictorial sub-
jects were used, often based on Raphael’s
work, with elaborate gilt scroll-work, but
the decoration was naturally very liable to
damage. Unfired lacquer painting and
gilding was used as decoration at the Hall-
in-the-Tyrol glass-house, which flourished
in the third quarter of the 16th century.
The spouted ewer illustrated is typical of
this work. In England, cheaper glass
products of the 19th century, such as
rolling pins and sugar basins, bore unfired
painted decoration.
Adding: The Skill of the Decorator
Lustre-painted Glass: An old technique
which was neither cold painting nor
enamelling, but did involve the firing-on
of a film of pigment to the glass, was known
as lustre painting. Depending on the
firing, the film became more or less
lustrous, and was almost imperceptible to
the touch. Exactly how it was done has
never been discovered, but there is reason
to connect the technique with that of
lustre-painting on tin-glazed pottery which
was practised first in Mesopotamia in the
9th century A.D. The method depended
on the reduction of metallic compounds
such as silver, copper or gold to the
metallic state by means of the carbon in
smoke. Generally speaking, the lustre
produced was reddish-brown in colour.
The technique was first practised in
Egypt, in either the late Byzantine or early
Islamic period, and was probably known
to Syrian glass-makers. In more modern
times platinum and bismuth have been
used as metallic compounds to produce
lusires on glassware (see Iridescent Glass).
Gold Decoration: Gold Sandwich Glass:
Apart from gold included in mosaic glass,
some of the earliest examples of gold
decoration are the gold sandwich glasses
found at Canosa in Apulia, Italy, dating to
the 3rd century B.C. (see Techniques
Before Blowing). After blowing was in-
vented in the 1st century B.C. the tech-
nique of sandwiching gold foil between
two glass layers was not abandoned, but
reached its most prolific period in approx-
imately the 4th century A.D. The majority
of these gilded glasses of the 3rd and 4th
centuries A.D. were found in the cata-
combs around Rome, embedded in the
plaster of the loculi, probably put there by
the relatives of the dead. These early
Christian fondi <f oro, as they are some-
times called, arc in fact the bases of
shallow bowls or dishes. The gold leaf
which was put inside the base ring of the
glass was engraved and sometimes, as in
the above example, had additional painted
decoration. This was covered with a
further protective layer of glass, which
was fused or cemented’to the base of the
bowl.
fragment of a bowi. in gold sandwich glass
depicting christ
lialy, 4ih century A.D. Diam. 90 mm (3′55 >n-)
The glass was broken away to the edge of
the gold decoration, so that a medallion-
like effect was achieved. Sometimes the
outer layer was coloured, but usually both
layers of glass were colourless. The sub-
jects depicted were taken from Jewish and
Christian symbolism and Biblical history,
but pagan motifs also appeared, such as
scenes from games and Classical myth-
ology, and dedications can be found to
circus heroes as well as to saints. The ware
was almost certainly manufactured at a
workshop in or near Rome. The name of a
4th-century A.D. bishop, Damasus, ap-
pears on several fragments, which helps
to date them, and since no more burials
took place in the catacombs after about
410 A.D., this could be assumed to be
their latest date. The workmanship on the
gold sandwich glasses is not usually of high
artistic merit. A disadvantage of the
technique was that air bubbles might get
between the two layers of glass and
disfigure the design.
tumbler in ‘/.mschengoldglas technique
Bohemia, about 1730. Ht. 89 mm (35 in.)
(See also colour photographs /(j and 14)
The gold sandwich technique is believed
to have been used in Rhenish glass
factories in Roman times. Fragments with
painted decoration have been found in
Cologne, in a style not seen on the glasses
from Rome. A series of Byzantine tiles
dating from somewhere between the 6th
and the 12th centuries A.D. differs in
being made up of fused gold glass covered
with a film of colourless glass. The method
was revived in the 18th century in Ger-
many, the products being called Zwischen-
goldgldser. Gold leaf was applied and
engraved on the outside of a tumbler,
which had previously been ground down
for about three-quarters of its height, a
projecting shoulder being left at the top.
A polygonal bottomless glass was then put
over the gold decoration, fitting neatly to
the shoulder. This outer glass projected a
little below the base of the tumbler, and a
further disc of glass, similarly gold-
engraved, was fixed in the space left.
Obviously, perfect precision was needed
if an airtight fit was to be achieved.
Bohemia, about 1710. Hi. 241 mm (9*5 in.)
Silver leaf as well as gold was used in
Zwischengoldgldser, and additions of ruby,
pink and green transparent lacquers occur
on some of the more elaborate later
examples-. This renewal of the gold sand-
wich glass technique seems to have been
concentrated in Bohemia at one or two
workshops. The best specimens date from
the 1730’s, but less skilled work was done
until about 1755. The glasses were deli-
cately engraved in gold with hunting
scenes, figures of saints and shields of arms,
usually of Bohemian families. That the
artists were aware of their early Christian
predecessors seems apparent from the
motifs used for the base discs of their
tumblers, such as the IHS monogram, and
Christian emblems comparable to those of
the early gold sandwich discs. Views of
monasteries and of local Bohemian saints
are among the decorations, the detail on
the gold leaf being scratched on with a
point. Though tumblers were the com-
monest shape used, other forms are found,
such as the covered goblet illustrated.
iimkik with medallions in TwiuhtWtUfUii
Johann Joseph Mildncr, Lower Austria, 1800
Ht. 102 mm (4 in.)
The gold sandwich glass technique was
also used in a highly personal way by
Johann Joseph Mildner (1763-1808) of
Gutenbrunn in Lower Austria. His finely
decorated gift tumblers have medallion
panels, decorated with red lacquer and
gold leaf in the Zwischengoldglas technique,
let in flush with the surface of the glass in
spaces cut exactly to receive them. Por-
traits, monograms, arms, allegories, land-
scapes, still life pieces and representations
of saints were used by him as motifs.
he inserted in his medallions
miniature portraits painted in colours on
parchment. Sometimes the medallions
were inserted in the bottom of the tumblers
as well as on the sides. A poem might be
scratched on the reverse side of the
medallion. Signed works are known be-
tween 1787 and 1808. The glasses arc
usually cylindrical, and are among the best
work produced in the Kmpire period.
Mildner’s technique continued the tradi-
tion established by the ancient Roman
medallions and the Zwischengoldgldser.
Stevens & Williams, England, beginning of 20th
century. Ht. 220 mm (q in.)
Stevens 6k Williams of Brierley Hill,
England, produced a glassware akin to the
gold sandwich glass technique at the
beginning of this century. John North-
wood II was its inventor, and he developed
it about 1000, calling it ‘Silveria’. It was
made by sandwiching a layer of silver foil
between two layers of clear colourless or
coloured glass. Northwood’s method was
to blow the first bubble of glass to almost
full size before the foil was picked up from
the marver on the bubble. It was then
plunged into a pot of hot metal, which put
a protective film of glass over the foil.
Trails of coloured glass, often transparent
green, were put on the surface somewhat
haphazardly. The original silver lustre is
retained as long as no air gets between the
two layers of glass. Pieces of Silveria are
often marked ‘S’ and ‘W’, and the word
‘England’ or a small fleur de lys may
sometimes appear.
picture in verre eglomise
By Zeuner, Netherlands, late 18th century
Ht. 201 mm (8 in.)
Verre Eglomise: When gold or silver leaf
is fixed to the back of a sheet of colourless
glass and etched with a point, the work
known as ‘verre eglomise’ is produced. This
can be backed with colour, e.g., lacquer or
oil pigments, to show through the areas
where the foil has been scraped away. To
protect the unfired painting and gilding, a
layer of varnish or metal foil or another
sheet of glass can be laid on the back of the
object. The term ‘eglomise’1 is taken from
the name of an 18th-century French
picture-framer called Glomy, who used
the technique extensively. It was also used
by an Amsterdam artist, Zeuner; little is
known of him, apart from his signed work,
though he did visit England in 1778, when
he exhibited a ‘landscape in metals’ at the
Society of Artists of Great Britain. Both
Dutch and English scenes can be found,
usually signed by the artist. Some English
views date to the early years of the 19th
century.
PLATE IN verre eglomise
Kngland, early 19th century
Diam. 219 mm (8-6? in.)
SEGMENT OF DISH WITH GILT DECORATION
Italy, first half of the 16th century
Diam. 191 mm (75 in.)
The pictorial and decorative engraving of
gold leaf on glass has been practised since
before the Roman era, although the name
verre eglomise is fairly modern. Early gold
sandwich glasses can be considered to be
a form of verre eglomise, as can the later
forms of gold-glass, such as the Zwischen-
goldgldser. A variation on the theme was
suggested by Johann Kunckel in his book
Ars Vitraria Experimental!! (1679). In this,
in effect, two beakers were made to fit
exactly together as in the Zwischengold-
glaser, the inner surface of the outer beaker
being painted with delicate veining to
resemble marble. The outer surface of the
inner beaker had gold leaf applied, and was
engraved in the usual manner. When the
two were fitted together, a double effect of
marbling and gilding in the glass could be
achieved. The plate illustrated is a skilful
example of verre eglomise belonging to the
early 19th century.
Gilding on the Outer Surface: Gilding is so
often found in conjunction with enamelling
on glass that it is difficult to separate the
two techniques completely. Both gilt and
enamelled decoration are fired to the glass
in an enameller’s kiln. Islamic artists, who
were such great enamcllers, also produced
gilding on their glasses, though true gild-
ing did not usually appear until after the
fall of Fatimid Dynasty in 1171. It was
during the 12th century that the Egyptian
art of gilding glass was transferred to Syria,
when artists from Egypt took service at the
courts of the rulers of Syria and North-
West Mesopotamia. The Venetians also
notably combined gilding with enamelling
on their glasses, the gilding having a
peculiarly light, soft quality. Occasionally
they used gilding on its own for decoration,
as in the dish illustrated, which has an
inscription appearing through a ground of
light gilding.
Gilding put on the outer surface of the
glass was always in danger of being rubbed
off, and with use many poorly gilded glasses
lost all traces of their original decoration.
Unfired gilt decoration (see next column)
would almost certainly rub off. When gold
in powdered form or as thin gold leaf was
stuck to the glass with an oily or adhesive
medium (as described) it could be fired to
it in an enameller’s kiln. This was a far
more durable way to gild glass, but was
rarely entirely successful. Even the gilding
on 18th-century blue, green and opaque
white Bristol glass, which is notably good,
has suffered a little with the passage of
time. The best-known motifs on Bristol
glass are the gilt fret border as on the dark
blue wine-glass cooler illustrated, and a
chain and label inscribed with the names
of drinks, such as Shrub, Rum, Hollands,
Gin and Brandy which are found on many
decanters; the stoppers of the decanters
often bore the initial of the drinks con-
tained.
DSCANTO WITH ENGRAVED AND GII.T DECORATION
France, end ol the 18th century
Ht. 327 mm (12-88 in.)
A somewhat simplified description of the
process of gilding was given first by
Haudicquer de Blancourt in his De F Art
de la Verrerie (1679). The second and more-
convincing method he described involved
painting the surface of the glass with gum-
water, applying gold leaf and washing the
leaf over with a solution of borax. Glass
ground to an impalpable powder was then
sprinkled over the borax, and the vessel
was put into the furnace and fired. Unfired
gilding was described by an English author
in 1735. A combination of chalk, red-lead
and linseed oil was laid on the glass, gold
leaf was applied and, when the solution
had dried, was polished. Dr. W. Lewis,
writing in 1763, recommended a solution
of amber combined with oil of turpentine
and a small amount of white lead and
minium. When this varnish had been
painted on the glass the gold leaf was
applied, the varnish allowed to dry, and
then the gold decoration was polished.
EWER IN BLUE GI.ASS WITH GII.T DECORATION
India, 18th century A.D. Ht. 280 mm (11 in.)
Unfired gilding could never match the
toughness of gilding which was burned
into the surface of the glass. For this, gold
leaf alone could be applied, or a flux could
be used with it. Gold leaf on its own, as
described by Blancourt, demanded an
extreme nicety in the firing of the glass.
When a flux was used under the gold leaf,
the firing was not nearly so difficult, but
the gilding tended to stand out from the
surface of the glass. Instead of gold leaf, a
precipitate of gold could be mixed with the
flux and fired, but the brightness of the
gilding suffered. For polishing the gold,
wolf, bear or hog’s tooth, or polished agate
and Venetian soap and water, were recom-
mended in an 18th-century manuscript.
Among the striking glassware produced in
India between the late 17th and the 19th
centuries were examples of fine gilding.
The glass illustrated is characteristic of the
Mughal industry, the poppy sprays being
a motif much used during the reign of
Shah Jahan (1627-58) and later.
VASE WITH COVER WITH ENGRAVED
DECORATION
Granja de San lldefonso, Spain, second half of
the 18th century. Hi. 508 mm (20 in.)
{See also colour photographs 1$ and 2;)
This vase is an example of the fired gilding
practised at the Spanish royal glass factory
near the palace of La Granja de San
lldefonso, near Segovia. Spain wished to
rival the French and German glass indus-
tries, and thus encouraged foreign work-
men to establish glass-houses from the late
17th century. There was little success until
Juan Goyeneche, with the help of foreign
workmen, managed to produce a good-
quality clear colourless glass. Encouraged
by Queen Isabella, Buenaventura Sit, one
of Goyeneche’s workmen, set up a glass-
house in 1728 near the palace of La Granja,
where he specialised in mirrors and vessels
in the Catalan tradition. First a French-
man, then a Swede, took charge of hollow-
ware manufacture, until 1768, when a
German, Sigismund Brun, took over the
direction of the factory, introducing fired
gilding and cut and engraved decoration.
After a period of expensive mismanage-
ment, the factory passed in 1829 into
private hands, and thenceforward made
only common glass.

JUG  DARK GREEN BOTTLE GLASS Willi
c OMBED OPAQUE WHITE THREADED DECORA I KIN
England, laic iSth early 19thcentury
Hi. 105 mm (4-13 in.)
PIPE IN (TEAR COLOURLESS GLASS WITH OPAQUE
WHITE STRIPED DECORATION
Probably Sowerby’s Ellison Glassworks, England,
about 1X60. I.englh 367 mm (145 in.)
Vessels made from bottle glass, and later
clear glass, with applied glass threads,
usually opaque white in colour, marvered
and combed to the surface of the glass,
have come to be known as ‘Nailsea’ glass.
The tradition that associates this type of
glassware with the Nailsea glass-house,
near Bristol, England, is a strong one, but
since this factory made crown window
glass, the earlier bottle glass wares arc
unlikely to have been made there. Because
most of these vessels were made as a
sideline, little documentary evidence re-
mains to show exactly when and where
they were produced. The few dated
examples come from the early part of the
ioth century. It is known that clear glass
‘Nailsea’ type wares were made at a glass-
house in Warrington in Lancashire. ‘Alloa’
glass is the Scottish term for a ‘Nailsea’
style glass. Though there is little direct
e\ idence, there is no reason why the Alloa
Glass-house in Scotland should not have
produced this glassware.
Many other simple wares in a style akin to
‘Nailsea’ glass were produced in the first
half of the 19th century. Among these were
the friggcrs, or glass fantasies—unlikely
objects such as fantastic tobacco pipes,
rolling pins, walking sticks, shepherds’
crooks, bells, witchballs and musical in-
struments represented in glass. Many of
the rolling pins and most of the tobacco
pipes have applied glass threads in opaque-
white or coloured glass, in true ‘Nailsea’
tradition. It is impossible to say where
most friggcrs were made, and they should
be considered as individual pieces of glass-
makers’ skill made both for amusement
and for commercial purposes. They were
produced as private sidelines in the largest
window glass concerns such as Pilkington
Brothers of St. Helens. Probably triggers
were made throughout the 10th century
but a new interest in them appeared at the
end of the century, when small factories
started to produce ruby pipes and bells,
spun glass ships and birds and walking
sticks in quantity.
JUG IN AMBER GLASS WITH WHITE BLOBBED
DECORATION
Found in one of the Aegean islands, mid-tst
century A.D. Ht. 238 mm (9*35 in.)
Marvering small pieces ofglass into the body
of a vessel is a somewhat cruder form of
decoration than applied glass thread-work.
The Romans certainly favoured this mode
of decoration for their vessels. This jug, in
amber-coloured glass, has opaque white
blobbed decoration. The white blobs cover
the whole of the body and the neck of the
vessel, though only a few stray ones can be
found upon the base. Pieces of white
opaque glass would have been scattered on
a flat stone slab (marver) and caught up on
the hot gather of amber glass on the
Roman glass-worker’s blow-pipe. By work-
ing the gather of glass on the marver, he
would bring the white glass level with the
surface of the amber glass, so that a smooth
surface was achieved when the vessel was
eventually blown. This 1st century A.D.
decoration was probably produced in
Northern Italy.
Adding: The Glass-maker’s Skill
FLASK IN PALE BLUE GLASS WITH ‘PEBBLED’
DECORATION
France, 17th century. Ht. 157 mm (6-13 in.)
Though the technique was never wholly
forgotten, the next notable instance of
small pieces of glass being used as a
decoration on the surface of the vessel
came in France in the second half of the
16th century. The technique had been
practised by the Venetians, and was copied
from them by the French glass-makers.
Their multi-coloured ‘marbled’ or ‘peb-
bled’ glass usually consisted of bright
opaque colours splashed on a light blue
glass ground. Shapes favoured by the
French glass-house which produced this
glass were the characteristically French
pilgrim-bottle and barrel-shaped vessels.
There are ample records that Venetian and
Altarist glass-makers worked in France
from the late 15th century onwards,
though few examples of their work have
been recognised. This ‘pebbled’ glass is a
genuine example of French glass a la
fag on de Venise, but remains distinctly
French in style.
Adding: The Glass-maker’s Skill
JUG IN GREEN BOTTLE GLASS WITH FLECKED
DECORA! IDS
England, 18th century. Ht. 181 mm (7-13 in.)
Glasses with flecked decoration, consisting
of fragmented coloured glasses marvered
into the surface of the glass, have often
been brought under the general heading of
‘Nailsea’ glass. This was indeed a charac-
teristic form of decoration for ‘Nailsea’
glass, besides the bold looped and striped
decoration described in the previous sec-
tion. As already mentioned, ‘Nailsea’
glass must be regarded as a style rather
than as a product of any specific glass-
house. Generally speaking, ‘Nailsea’ glas-
ses were made in green bottle glass,
which was used for its cheapness, as it
avoided the Glass Excise Acts of England
(repealed in 1845). Clear glass with striped
and flecked decoration is sometimes also
ascribed to Nailsea and Wrockwardine
Wood, though it was probably produced at
many of the other centres that made this
type of glassware. Products notably in-
cluded jugs, bottles and flasks in the flecked
ware, though more fanciful examples can
be found, such as top hats.
Hobhs, Brockunier& Company, U.S.A., 1884
Ht. 152 mm (6 in.)
In 1884 a patent was issued to William
Leighton, Jr, of Hobbs, Brockunier &
Company of Wheeling, West Virginia, for
his method of producing ‘Spangled Glass-
ware’. His process was a simple one. Flakes
of biotite or mica were laid on a marver and
picked up on a gather of opaque white or
transparent coloured glass. The gather
with the flakes adhering was then dipped
into a pot of clear colourless glass, which
locked in the ’spangles’. The gather could
then be blown and shaped into the desired
article. Spangled glass became one of the
most popular products in both art and
table glassware produced by the Wheeling
company. Sowerby’s, of Newcastle-upon-
Tyne, England, produced a similar ware,
usually with a deep blue base called ‘Blue
Nugget’. ‘Spatterglass’ is similar to Span-
gled glass, except that instead of metallic
flakes, variously coloured fragments of
glass were marvered into the opaque white
or coloured glass base.
About 1884. Ht. 127 mm (5 in.)
In the same style as the foregoing were the
so-called ‘Vasa Murrhina’ glass products.
Coloured glass and mica flakes were em-
bedded in the opaque base, with an overall
transparent casing. John Charles De Voy
of the Vasa Murrhina Art Glass Company
of Sandwich, Mass., and Hartford, Conn.,
registered a patent for this type of glass-
ware in 1884. Sheets or particles of mica
were coated with gold, silver, copper or
nickel. The coated mica was then incor-
porated on to a gather of glass, which was
subjected to heat. This caused the glass to
flow over and adhere to the mica. The
gather could then be blown into the article
required. Shards of ‘Vasa Murrhina’ type
glass have been found on the site of the
company’s factory in Sandwich, also on
the old factory site of the Boston &
Sandwich Works. Patents for this type of
glassware were registered in England
between 1878 and 1882.
WINE-GLASS INCORPORATING rHREADS Of OPAQUI
WHITE GLASS
Venice, Italy, 16th century. Ht. 131 mm (5-13 in.)
Incorporating threads of opaque white glass
into the body of a vessel was a development
of the Venetian glass-makers. Thin rods
of opaque white glass (lattirno) were
probably set at exact intervals round the
inside of a heat-resistant open container.
A gather of clear, colourless glass would be
blown into the centre of the container, and
the rods of glass caught and worked very
gently into the gather of glass. The bubble,
now containing the white threads, could
then be blown to the desired shape.
Another method that might have been
used by the Venetians was to lay alternate
rods of opaque white and clear, colourless
glass side by side on a tray, and then to fuse
them together in a kiln. These could then
be caught up on a gather of clear, colour-
less glass and blown to the shape required.
In both these processes, in order to make
the ends of the rods meet, the end of the
bubble would have to be pinched together
and the unwanted glass cut away.
The influence of Venetian glass-making
spread all over Europe, notably to Spain,
Germany, France, the Netherlands and
England, during the 16th and 17th cen-
turies. Thus the technique of incorporat-
ing threads of lattimo glass into the body
of a vessel appears in other glass-making
centres besides Venice. Each of the Euro-
pean countries mentioned developed its
own version in the facon de Venise, the
influence of the local glass-blowers making
itself felt, so that pure Venetian inspiration
vanished and strong regional characteris-
tics began to prevail in the glassware. The
jug illustrated—a remarkable example of
the use of broad vertical bands of lattimo
glass between very narrow lines of clear,
colourless glass—is, in shape, a vessel of
typical late mediaeval form in the Southern
Netherlands. The contemporary value of
the piece is reflected in the use of silver-
gilt mounts on rim, handle and base. A
similar glass is listed in the 1559 Inven-
tory of Queen Elizabeth I of England.
In Roman times glass-makers sometimes
decorated the edge of vessels with a rope-
pattern, where an opaque white thread was
twisted and embedded in clear, colourless
or coloured glass. This is the only early
parallel to the Venetian technique of
incorporating threads of white glass into a
vessel. The Italian glass-makers who
migrated to other countries, and their
pupils, certainly had full command of the
technique. As well as the illustrated flute
glass, which has made delicate use of the
technique in the long bowl, handsome-
tankards employing the technique were
produced at Liege or in the Netherlands.
In Germany, the popular tall cylindrical
glass, or ‘Stangenglas’, was not only made
of cristallo glass, but was often decorated
with these bands of lattimo glass incor-
porated into the vessel. Rarely, coloured
as well as opaque white threads were used,
in colours like yellow, purple and blue.
Adding: The Glass-maker’s Skill
A superb sophistication of” the technique
just described is shown in the plate
illustrated. It is in fact made up of two
plates, with opposing white radiating
thread decoration, which were fused to-
gether to form one piece. Tiny air bubbles
were caught between the threads, giving
the plate a rich and delicate appearance—a
wonderful example of the Venetian glass-
maker’s versatility. The essentials of the
technique have been copied successfully
by the American glass artist and tech-
nologist, Dominick Labino, of Grand
Rapids, Ohio. He placed 12 opaque white
threads in a metal container at even dist-
ances and worked these into a gather of
glass, as already described. He then blew
the gather into a bubble, catching the end
of it and twisting the glass one way so that
the threads spiralled to the left. After
forming a bowl shape, he put this into a
specially prepared crucible and placed it in
the annealing kiln to keep warm.
The next stage in the production of
Labino’s vetro di trina was to repeat the
procedure with another gather of glass.
this time with the 12 threads spiralling to
the right. The first bowl shape was then
taken out of the annealing kiln in its
container, and the second partially-blown
gather dropped into it, so that the two were
joined when further blowing was em-
ployed. The two joined paraisons were
then reheated, and a further gather of glass
taken over them, to give the finished object
added strength. From this Labino formed
in the usual way a dish which had opposing
white radiating thread decoration in the
Venetian tradition. The Italian name for
this type of glass means iace glass’; in
German it is known as ‘Netzglas’. Apsley
Pellatt in his book Curiosities of Glass-
making (London, 1849) describes basically
the same technique, whereby two cup-like
formations, one with milk-white canes
spirally applied inside the cup, the other
with milk-white canes spirally applied
outside, were combined, the former over
the latter, to produce a vessel in vetro di
trina. The technique was used in England
and on the Continent in the 19th century.
In the mid-iqth century, Bohemian,
French and English glass factories all
imitated Venetian techniques of glass
manufacture. This included the incor-
poration of opaque white or coloured
threads of glass into the body of a vessel.
So-called 19th-century ’striped’ glass fol-
lowed this technique. Coloured and clear,
colourless glass rods would line a mould.
A bubble of glass blown into the mould
picked up the rods, and they became as one
with the body glass. When the bubble of
glass was deftly twisted, the embedded
rods could be made to spiral around the
body of the finished vessel. To produce
the fine effect seen on the ewer illustrated
demanded a considerable amount of skill
on the part of the glass-maker. A patent
for ‘Improvements In Decorating Glass
With Stripes’ was taken out in 1885 by
V\ illiam Webb Boulton of Bonbon &
Mills, who had the Audnam Bank glass-
house in England.
Ice Glass: The Venetians decorated some
clear glass by plunging a bubble of hot
glass for a moment in water and then
reheating it. This produced a roughened,
fro/en or crackled appearance, given the
name ‘Ice Glass’. A further means of
producing a frosted effect upon glass is to
roll a bubble of glass over a marver that
has previously been covered with frag-
ments of broken glass. The fragments
adhere to the hot bubble, and when the
whole is slightly reheated, form an ‘icy’
effect. The bubble can then be worked to
form the desired article. The beaker
illustrated is a handsome example of the
Venetians’ work. The frosted texture is
only on the outer surface of the glass, the
interior surface remaining smooth to the
touch. Visually, these pieces appear to be
covered with cracks, but the reheating
makes them perfectly whole and quite sale
for use. Once the technique had been
invented by the Venetians, it spread
quickly throughout the Continent.
Apsley Pellatt (1791-1863), the 19th-
century glassmakcr of the Falcon Glass-
house in Southwark, London, continued
to make his mark on his trade by the
publication of two books on glass-making,
published respectively in 1821 and 1849.
In his Curiosities ofGlassmaking, published
in 1849, he described several of the
Venetian techniques, including the pro-
duction of ‘Ice Glass’ or frosted glass. At
the 1851 exhibition his firm made a special
display of the technique, which he called
‘Anglo-Venetian’. In his explanation he
shows how a gather of glass was slightly
inflated, then plunged at nearly white heat
into cold water; it was then immediately
reheated, giving a crackled effect on its
outer surface. The bottom of the bubble
was flattened and a pontil rod attached;
the blow-pipe was removed and the article
finished on the pontil rod. Great care had
to be taken not to overheat the article, as
this would melt out the frosting.
Apsley Pellatt claimed that the technique
of ‘Ice Glass’ was known and practised
only by the Venetians until he revived it in
the mid-i9th century. This would seem to
be incorrect, since several examples of the
technique are to be found from the
Continent between these dates. At first,
only clear colourless ‘Ice Glass’ was pro-
duced, to simulate real ice, but mid-igth
century fashion soon desired it to be
coloured. Usually the base glass was
coloured in ruby, rose, yellow, blue or
green, the fragments picked up being clear
and colourless. Occasionally the reverse
happened, the fragments being coloured
and the base glass clear and colourless. Ice
Glass known as ‘Craquelle’ and ‘Overshot’
was produced by the Boston & Sandwich
Works, and possibly by some other
American factories. It was advertised in
1883 by Hobbs, Brockunier & Company in
‘Rose, Sapphire, Old Gold and Marine
Green’ colourings.

Techniques before
Blowing
Glass has been made for over four thousand
years and is thought to have first been pro-
duced in Western Asia. As an independent
substance—that is, not just as a glaze—glass
seems to date from somewhere in the jrd
millennium B.C. At first, small objects,
mainly beads, mere made, and not until the
late tbth and 15th centuries B.C. did the
first vessels appear. The earliest glasses are
found in Western Asia on sites such as Tell
al Rimah and Assur, and then in Egypt,
where a glass vessel industry was almost
certainly established during the second quar-
ter of the 15th century B.C. Production of
glass vessels almost ceased, however, after
1200 B.C., and it was only in the gth century
B.C. that manufacture was revived, in Asia,
on the Syrian coast and in Mesopotamia.
The centre of glass production shifted to
Alexandria in the 4th century B.C. after
Alexander’s conquest of Asia, and it was
probably from there that glass-making came
to Italy in the first century before Christ.
botti.e in opaque white glass with opaql
turquoise trails
Found al Ur, r.1300 B.C. Hi. 113 mm (4.45 ii .)
(See also colour photograph 2)
The Core Technique: Fourteen hundred
years before glass-blowing was first in-
vented, in the 1st century B.C., four \ery
distinct techniques were already use< in
making glass. The first and most important
of these is the core technique and the
majority of pre-Roman vessels were made
by this method. A modelled core, possibly
made of mud bonded with straw, was fixed
to a metal rod and covered with molten
glass. When the core was sufficiently
covered, the outer surface was marvered
(smoothed) on a flat stone slab. Trails of
coloured glass would then be added, which
could be combed up or down to form
patterns. The vessel was once again
marvered, then handles, foot rest and fim
were added as desired. When the glass had
cooled the rod could be removed and the
core picked out piecemeal. The technique
was skilful and laborious, and the glass
vessels thus produced were a luxury item
for the nobility.
Techniques before Blowing
In F.gypt, the first vessels appeared in the
reign of Tuthmosis III (1504-1450 B.C.).
During this period the boundaries of
Egypt were at their widest, stretching
from the Euphrates to Nubia, and Tuth-
mosis III became one of the most im-
portant Pharoahs of the 18th Dynasty. His
Asiatic conquests began in 1481 B.C., and
were the probable reason for the founda-
tion of a glass vessel industry in Egypt.
The fact that three glass vessels have been
found bearing his cartouche could in fact
signify that the new industry was trying to
do honour to the Pharoah who gave it
birth. (So far as is known, the glass vessels
were not his personal property.) The glass
illustrated, formed in the shape of a lotus
bud, was produced by the core technique;
it is the earliest and most beautiful
example, in turquoise-coloured opaque
glass with blue and yellow thread decora-
tion. (See Trailing, pp. 81-2.)
Core-formed vessels normally averaged no
more than 100-200 mm (approx. 3-Q-7-8
in.) in height, although a few larger ones
have been found in Egyptian royal tombs.
They appear to have been used for
unguents or perfumes. The earliest exam-
ples, from Egypt of the 18th and 19th
Dynasties, are the finest in colour, shape
and design. The Mesopotamian vessels
which have been found are distinct enough
in shape to indicate separate workshops,
although Egypt exported to Syria, the
Levant and Cyprus. It was probably in
Mesopotamia that the technique was
preserved after c.1200 B.C., to be revived
in the Levant in the 7th century. The craft
was organised by the Phoenicians, whose
traders spread glass products throughout
the ancient world, bartering them for
Cornish tin, Baltic amber and other non-
Mediterranean products. New shapes then
appeared, based on Greek forms, such as
the oinochoe, and were used in the Eastern
Mediterranean and Italy from the 7th
century B.C. onwards.
Techniques before Blowing
Amphoriskos in brownish-green glass with
white and yellow opaque trails, clear amber
hankies and base-knob
Cyprus, 2nd ist century B.C. Hi. 165 mm (65 in.)
(See also colour photograph 2)
In the 2nd and 1st centuries B.C. new
core-formed shapes appeared, based on
contemporary late Hellenistic ones in
other materials, such as the amphoriskos,
the alabastron and the round aryballos.
After the invention of glass-blowing,
however, this laborious core technique
almost immediately died out. The last
examples of the technique achieved a
certain grace; note the clear amber handles
looped on to the body of the vessel in the
example illustrated. However, they did not
reach the high levels of artistic excellence
that can be seen in the examples from
c. 1500 B.C., and also during the time when
El Amama was flourishing (1377-1345
B.C.). The famous excavations by Sir
Flinders Petrie on the site of Tell-el-
Amarna revealed the existence of glass-
workings on a large scale. A number of
Western Asiatic sites, such as Atchana/
Alalakh, Nuzu, Assur and most recently
Tell al Rimah likewise revealed glass from
the 15th century B.C. and before.
ewer and ai.abastron
Modern replicas by Dominick I^bino, U.S.fk.
Hi. of each e.Sq mm (3-5 in.)
The mystery of the true nature of the tort
technique has been much discussed. Fo
many years it was thought that the coi c 01
which the glass was gathered and marv
to shape was made of sand. Re
research has proved this to be wrong,
the core was more likely made of mud
bonded with straw. Dominick I.abinc
from Ohio, U.S.A., attempted to find ou
how these vessels were produced bj
making them himself. After numefou!
experiments he found that he cOulc
successfully reproduce any of the andien
shapes by trailing glass from a dipstic : 01
to a preheated core. The trailing was < on«
in the furnace over the crucible (glass
making pot), the vessel being remdved
only in order to marver the surface off th<
glass. He successfully applied trailer,
decoration, handles and feet to the vessels
After the temperature had been brough
above the annealing range, the vessel wa:
slipped off the metal rod into an annealing
oven; the core was removed after the glas;
vessel had cooled.

FILLERS AND CEMENTS
Fillers and cements arc used for the repair of china, glass, wood and occasionally metal. Adhesives are also used as fillers and cements, with the addition of a little colouring matter or powder to give them colour, body or both.
Plastic Padding. Described in the section on adhesives, this makes a useful filler for metalwork because of its colour, and it needs no further additives for this work. It is not usually used for china restoration work.
Wood fillers. There are several makes of plastic wood which are used as fillers for small holes in woodwork.
Wood filling compounds of various kinds and in various colours can be bought, in proprietary brands, and these are tenacious and excellent. When dry, fillers can be sanded to a smooth finish. Epoxy resin fillers such as Araldite, suitably coloured with dry powder pigments or oil paints, can be used as fillers for rebuilding small missing sections of woodwork. The slow drying of sonic types
makes them rather difficult to use, and care must be taken that, in larger repairs, shrinkage does not leave hair cracks between the new pieces and the old.
Various compounds are used for filling, and making casts and pressed moulds, and for modelling new pieces where it is not possible to make moulds.
Bondapaste. This is an excellent adhesive filler which can be built up on itself in layers, and when hard can be worked with files and gravers. It is a good filler and cement for china restoration needing no additive. It dries quickly so any moulding or modelling must be done fast.
Isopon. This is a paste filler which is mixed with a hardener. It dries quickly and doesn’t shrink under heat, and it needs no parting agent to separate it from the mould. It can be fined and abraded with glass paper and other abrasives. It sticks to itself so it can be used in layers, but it does not stick to china, so after hardening and removal of the mould, it must be stuck to the china with Araldite, exactly as if it were an ordinary broken piece. It can only be worked for about ten minutes before it becomes too tacky, but this is an advantage when you are fairly practised and it can be used for quite large pieces without internal support as it sets fast, so will not sag so readily as a slower setting filler. The fact that it will not adhere to plasticine also allows props and pads of plasticine to be used to support it while it is drying.
Plaster of Paris. Widely used for the making of moulds, it is quick drying and easy to handle, but it is not suitable by itself as a filler, being too soft and porous.
Seccotine with dental plaster. A hard setting adhesive mixture which is very useful for small repairs to gesso where the object is never going to come into contact with water.
Cascantite with dental plaster. Another good mixture, which can be cut and shaped with woodworking tools, provided it has not dried out completely (see Adhesives for details of Cascamite). It has the disadvantage that it must be stuck into place as it is not self-adhesive. It is most useful for filling Alabaster which it matches perfectly.
Araldite. The two tube epoxy resin adhesive described in the section on Adhesives is the most versatile filler, having but two disadvantages. It is rather sticky to use, and it dries very slowly so cannot be used for large unsupported pieces. However, it sticks so well to the object being mended, and, when set, it approaches so closely the appearance of biscuit china, that many restorers prefer it to the quicker setting compounds. It can be mixed with whitening, or kaolin or titanium dioxide to make a filler for china. Mixed with these same materials, it is also an excellent cement for use when dowelling.
Sawdust, stone powder, metallic powder, colouring pigments, either dry powder or oil paint, will all mix with Araldite to simulate almost anything you like to name.
will
It blend and adhere to the whole piece and strengthen it enormously. In the old days, plaster of Paris was used for this kind of building and restoration, but it was not strong or waterproof, whereas epoxy resins are both. Ali example mentioned in the section oil Aniis and Armour is the building up of an old worm-eaten gunstock with epoxy resins coloured to match. It can be injected by hypodermic syringe into wooden holes or cracks where it will strengthen and preserve. Unfortunately it will not take a very high Polish which may limit its use.
Fillers for Glasswork. Modern acrylic resins, which are usually powders with which a liquid is mixed, are ideal for glass restoration and repair, as if mixed with care so that there are no air bubbles present, they set to a trans- parent, very slightly yellow material which is as near to glass as you can get. Acrylic resins call be coloured with dry powder pigments to simulate coloured glass or china, and sonic can be bought already coloured.
Tensol Cement No. 7 and Aertilite Cold Curing Resin are two excellent products in this range. his is another versatile acrylic resin mentioned several times in this book. It can be used, mixed fairly thinly, to coat things made from cane or wickerwork to strengthen or preserve them, and to mend glass or certain types of china. With care it can be mixed with dry powder pigments to simulate jasper (`Wedgwood’) ware. Acrylics are not particularly difficult to handle, and in fact they are great fun to experiment with. They make excellent solid `glass cases’ for small objects which you wish to preserve. The technique for doing this is not within the scope of this book, but it is easy enough to work out for yourself, bearing in mind normal casting techniques!
Use acrylics according to makers’ instructions in so far as mixing etc. is concerned.
Gilder’s Coinpo. Invented by the Adam brothers, it has ever since been used for all kinds of moulding work instead of woodcarving, and is still a most excellent material for repairing moulded picture frames or some types of nioulding on furniture and fittings.
Recipe I.
i lb. Scotch glue 2 lbs. resin
i gill real turpentine T pint linseed oil whiting
Dissolve die glue in a gallon of water. Boil the resin, the turpentine and the oil together, and then add to the glue and water. Boil the whole lot together until the liquid has reduced a little, so that the mixture is not too runny. Add this to the whiting powder in a bucket, stirring constantly until the whole has the consistency of dough.Boil all the ingredients together for half an hour, and then add to a bucket containing whiting, rather as one adds milk and eggs to a bowl of flour when making batter. Mix until the compo has the consistency of dough.
FLY MARKS
Fly marks call be scratched offmany objects with a sharp knife or even with the point of a needle. Chalk mixed with a little ammonia will remove fly blows from a hard surface such as stone. Fly blows on glass or any surface which will
can
not be damaged by it ca be removed by washing with a five per cent solution of caustic soda, followed by rinsing. Solvents such as petrol or benzine will remove fly marks, but will also remove varnish, so be careful.
Fly marks on prints call sometimes be removed by alternate baths of ]lot and cold water in that order, and then drying out between pieces of blotting paper.
FRAMES
Painting and Texturing. Picture frames come in all shapes and sizes, complicated and simple, and there are just as many techniques for restoring and renovating them. They can be cleaned and painted with varnish or matching paint, gilded, given two-tone or antique finishes, textured or spattered. It depends a great deal on the type of frame which of these methods is used, and also oil the picture, which could well be killed by all over-weight frame or one coloured incorrectly. The frame should never be lighter in colour than the lightest part of the painting. Don’t put a white frame round a picture which does not contain white. If the frame is too glossy, the highlights distract the eye from the picture itself. Frames can also be made into trays, by adding a suitable centre, or into mirrors. Frames for watercolours, pastels, or photographs, which have glasses, should be as simple as possible so as not to overpower the picture.
First clean the frame thoroughly. Oil a simple wooden one, detergent, water and sandpaper all carefully used should remove old grease and grime. While the frame is drying, the type of repainting or decoration ion can be decided upon. If it is a plain frame in good condition, a light rub down with a fine grade of sandpaper will probably be all that is needed before a new coat of varnish is applied. Of course the varnish call be taken off, and the frame left in its natural wood state and just lightly rubbed with wax Polish, but if the old surface is stained or badly scratched, the new coat must be opaque, and some kind of paint is the answer. Ordinary household paint or plastic emulsion in a suitable colour looks quite well, but with a little more trouble, really exciting finishes call be obtained, and in most cases a broken finish definitely  looks best.
Polymer colour water based paints made either by Rowney under the trade name of Cryla, or by Reeves under the name of Polymer colours, are particularly useful, as they can be applied very thinly producing a pickled effect over stained wood, or else thick as squeezed from the tube, and then figured, or used for two-tone work. Polymer paints contain water and should be water thinned to the required consistency, not with turps or white spirit. They dry very rapidly, but if you want to slow down the process, use the special retarder. The colours, which conic ili the full range of artist’s oil paint colours, mix very well, and when dry will have a slight sheen, which is excellent for frames. A gloss medium is obtainable, or, although it is not really necessary as the paint is quite waterproof when dry, it can be overpainted with a polymer varnish to keep the frame in first class condition for years. Any tools or brushes used to apply the polymer paints should be washed thoroughly in water before they dry out, but if this is forgotten, a soaking overnight iii methylated spirit will the trick. Acetone will also dissolve these colours.
Texturing with polymer colours is not too difficult. The paint should have the consistency of thick cream. It should be painted on to the frame fairly thickly and, while it is still sticky, textured with a comb, toothbrush, an old wire brush, or anything else you caii think of that would scrape interesting patterns in the paint. A little practice on an odd scrap of wood painted with polymer, will give you some idea of texturing. Another method is to put oil different coloured layers of polymer, letting each one dry before adding rile next, and cut through these with varying pressures to get the colours showing through at different levels. Diagonal, cross, mitre or lengthwise strokes can be used, and if you get really ambitious, all sorts of curved lines and squiggles. Another way of texturing is to paint the frame with polymer, and then while it is still sticky, sprinkle on a little sand, or rice, or any other small hard grained substance, shake off the surplus, and when dry overpaint with another thinner layer of polymer, and then finish with polymer varnish. A small sponge gently pressed into sticky paint will also give an interesting finish, especially if the two-tone effect is desired, using a double layer of paint. Spattering gives a nice spotty effect and should be applied over the plain basic colour oil the frame by gently tapping a water paint brush loaded with the colour you want to apply. To make large spots hold the brush near the surface, and with a little experimentation the size of the spots can easily be adjusted.
One very useful process for finishing off plain frames or parts of ornamental ones is to rub on colour. This gives a nice soft finish and it is particularly good for insets, which can look far too hard and glaring against a light toned picture. Any oil based paint call be used and a handkerchief should be lightly smeared with this, and then the surplus paint rubbed off on an old piece of newspaper. The lightly charged cloth is rubbed gently 01, the frame, and the pressure increased until the right effect is obtained. The cloth should be recharged as necessary, but never too much as the more sparingly paint is applied tile softer tile finish will look, and it is not necessary to work it in too evenly. Burnt sienna is a particularly good colour for insets. If you want a simple gilded effect a paste made by Reeves called Restoration or an American product called Treasure Wax Gilt do an excellent job. They come in many roues of gold, bronze or silver, and are very easily applied with a cloth or finger oil to tile cleaned surface. If a bright finish is required, it should be put on fairly thickly and allowed to dry completely before being rubbed down with a soft cloth. This method is by far the best way to touch up any old gilding as the application of gold leaf is really an expert’s job (see Gilding).
heavy piece of chain, are common enough practices with disreputable dealers, but any old frame bought in a junk shop will probably have enough natural blemishes to make this unnecessary, and it all sounds rather too violent. Applications of different paints can make almost any frame look a lot older mid more interesting than it really is. Coats of paint are rubbed oil in, irregular patches and then smoothed down lightly with fine sandpaper. Deep depressions can be left dark, and bright colours should be put on sparingly. Yellow ochre, chrome yellow, raw uniber, venetian red and bumf sienlia, are all suitable colours, and when they have dried out and been sanded down, a thin coat of burnt sienna diluted with turpentine is overpainted, and later spots of gold or silver Restoration or Treasure Gilt call be rubbed oil in small areas, or tile whole frame spattered. The effect of old gold leaf call be obtained by painting the frame with a thick layer of venetian red, and then repainting with a good quality bronze paint such as Treasure Gold Liquid Leaf When it is dry, it should be rubbed with steel wool until the red shows through in places. Restoration wax call be used instead of the bronze paint, just put on rather unevenly, but it must be remembered that genuine gold leaf gets rubbed off in natural wear and tear on the raised surfaces, while tile depressions will keep the gold, and it is not so easy to get a natural finish without any rubbing off.
Mending. Old picture frames get pretty knocked about in junk shops, especially when tile pictures have been removed and tile glass broken. Usually it is the corners which go, the whole frame wringing in all directions. Corners can be strengthened quite easily (see Fig. 17)_ If the glue and the tacks which secure the frame have gone, take the frame to pieces, and remove the remains of the tacks and clean off  Sand the faces of the comers down to the natural wood, so that you have a clean surface to work on, and then put an impact adhesive, on both faces of the comers and leave it for the time specified by its makers before bringing the two faces together. In order to get good right-angled corners, use a comer cramp. These c.-ui be bought at hardware stores and arc so useful that I really do suggest that you get one and do not try to square the comer any other way, although it can be done. One method is to work with the frame on its face. Put the two faces together and square the comer using a try square to measure it and then tack a thin piece of wood diagonally across, so that the frame is held rigid until the join has set. This will hold the corners accurately, but will not put any tension on the join. To hold the comer, in addition to the adhesive, drive tacks in diagonally across the join, making sure that you don’t use tacks so long that they come right and also try to get them into the through the other side, and
thickest section of the frame. Small holes can be drilled across the corner, and a woodc’, peg inserted. If you mean to do this, it is best to drill the hole with the frame held tight in the corner cramp, before putting on the glue.
If it is not possible to mend the frame iri this way, or if you do not want to dismantle it entirely, the corners can be dowelled, or a plate can be screwed on to the corners, at the back. Depending on how big and heavy the frame is, put in a strip or triangular corner plate (see Fig. 17). If a strip is used, sink it into the frame by cutting right across the corner to the depth of the strip with a tenon saw, and then chipping out the piece with a chisel. Wooden strips and plates are better than metal ones, and plywood is fine for the job.
If you wish to make a frame smaller, this can be done without separating all the covers. Measure opposite sides to the correct lengths, at opposite ends, then cut through the two corners using a mitre box, and rejoin (see Fig. 18). When measuring frames, always remember that the edge of the frame overlaps the glass and the picture, and that you must allow for this when measuring. It is easier to measure your picture and/or glass, and then measure the frame at the inside edge of the rebate which takes the picture.
Mending Mouldhnq. If the plaster moulding of a picture franc is really badly damaged, you can always strip it all off and just use the basic wooden frame. A power drill with a rough sanding disc will take off a lot of the old plaster quickly, but some of the awkward angles will have to be done with a hand scraper.
Clean all mouldings with a hog’s hair paint brush, a sponge mid methylated spirit. Never make a frame too wet or the plaster may dissolve.
plaster mouldings are all too often broken off in great lumps. Replace these quite simply by making a moulding from an identical, but unbroken section of the frame. This is done in the same way as pressed moulding for china (see Fig. rg). Make a mould with Plasticine for small sections, and then cast a piece by pouring plaster of Paris in the mould, or preferably for small sections by making a filler with Araldite mixed with kaolin powder (use a parting agent in this case), or Cascamite and dental plaster, and pressing this into the mould. The pressing is allowed to harden and then, before it is so hard that it will not stick, is carefully put in place on the break. A little straight Araldite adhesive on the face of the broken part will help adhesion. To make a mould of a large section, or one which has any undercutting which would hook round a plasticiric pressing, use dental impressioncompound (Paribar) and make a pressed mould with this, first greasing the moulding with vaseline. Paribar can be reused many times, and no parting agents are needed before putting in
the plaster of Paris filler.
Gilder’s Compo can be used (see Fillers) and this is recommended for extensive work. It has many other uses for moulding of all kinds and is the traditional material—superseded, but not necessarily improved upon, by plastics and resins.
The mouldings can also be made in Isopon or Bondapaste filler, which dries much more quickly than Aralditc. It is a matter of personal preference, really. All these materials make mouldings which when set can be cleaned tip with needle files and abraded with glass paper until they are satisfactorily smooth.
ruler with a bevel edge and a Stanley knife (see Tools), and cut the board with a bevel. Special mat trimmers can be bought from artists’ suppliers. The secret is to cut the bevel the same all the way round and to get the comers neat. The knife must be perfectly sharp. It is difficult to stop the ruler from slipping about, and a strip of very fine sandpaper stuck oil will the bottom of it wihelp. The bevel edge can be gilded if liked.
The mat is placed oil the picture, which in turn has been put on a mount which is bigger than the hole in the mat. Photographic mountant is excellent for this job, either the paste type, or, if there is no danger involved in heating your picture, the type which is painted on with a brush and then bonded by pressure with a warm iron.
Mounts arc just pieces of cart{    which the picture is stuck; the mount being big enough to fit the frame exactly.
Linings are rather more complex, and call be most effective, both for bringing a frame down in size, and for making a picture look better. A lining may be just a strip of gilded wood inside the main frame, or it may be a wider inner frame covered with material such as linen or velvet or sheet metal. The wood inner frame is made exactly to fit the rebates of the main frame, and is mitred at the corners. The covering material may be stuck or pinned to the lining. In order to make a neat job at the corners, it is usually best to cover the pieces before joining them.
One last word—always check wire, cord and screws used for hanging up pictures—more often than not the wire is rusted, the string is rotten, and screw rings are rusted or loose. It call be a little disappointing if two weeks later all your hard work oil painting, moulding and mending together with that expensive piece of glass end up in a shattered heap on the floor.

Antique Engraved Glass

Engraving, whereby a decorative pattern is finely cut onto the surface of the glass, dates back to Roman times. The very earliest types of engraving were diamond-point engraving, which involves scratching fine lines into the glass with a sharp instrument (usually a diamond stylus), and wheel engraving, where the design is cut into the glass by means of a rotating
wheel. Stipple engraving, a more sophisticated form of diamond point engraving, where patterns of tiny dots rather than lines at used to create a shaded design, was first used from c.1621 acid etching, which involves burning a design out of the top layer of glass with acid, evolved with the invention
hydrofluoric acid c.1770 and was widely used in Britain.
Although glass was engraved from Roman times, and examples of fine engraving exist on 15th–century Venetian glass, the widespread use of such techniques as diamond-point and stipple engraving dates mainly from the second half of the 16th century. These techniques were introduced to decorators in the Low Countries by itinerant Venetian glassworkers. Wheel engraving was first used in Germany in the late 16th century.
DIAMOND-POINT AND STIPPLE ENGRAVING Diarnond-point engraving, in which the design or decoration is scratched onto the surface of the glass by a sharp diamond stylus, is particularly suited to thin-walled glass too hard to withstand wheel engraving. It was the only engraving technique suitable to
be used on delicate cristallo glass. Diamond-point engraving was therefore quite common on 15th-century Venetian and later facon de Venice (”in the style of Venice”) glass. However, the technique did not reach its apogee until it was taken up in the Low Countries during the 17th century, where it was carried out by both amateur (those who decorated glass as a hobby) and professional glass decorators. Anna Roemers Visscher (1583-1651) was an amateur glass decorator in Amsterdam, where she engraved delicate designs of flowers, fruit, and insects, as well as lines of poetry in calligraphic script, on beakers and Romer (a type of drinking glass). Another distinguished amateur glass decorator, Willem Jacobsz van Heemskerk (1613-92), in Leiden, produced most notably free-flowing calligraphic designs on such wares as bulbous serving bottles and jugs. Among the best-known professional engravers was Willem Mooleyser (active 1685-97), from Rotterdam, who used diamond-point engraving on bowls, flasks, goblets, and Romer.
In stipple engraving, which is a development of diamond-point engraving, a stylus is very gently tapped on the glass to make a design built up of small dots; these dots create areas of light (dense areas of dots) and shade (sparse areas of dots) to create the delicate design. The detail may be so fine that the design will Only be seen clearly when the glass is held to the light. Common designs include portraits and allegorical Subjects. Examples of stipple-engraved glass are rare,
as the technique is slow, extremely difficult, and requires great skill and patience.
As with diamond-point engraving, the most notable designs were produced by glass decorators from the Low Countries. Visscher introduced the technique to The Netherlands c.1621, but perhaps the best-known exponent was Frans Greenwood (1680-1761), an amateur glass decorator in Dordrecht who employed the technique exclusively from c.1722. He incorporated floral and fruit motifs and also copied designs from contemporary mezzotints and paintings. One of his followers was David Wolff (1732-98),
), a painter who
produced his own designs and portraits. Some of Wolff’s pieces are signed and his style inspired other artists towards the end of the century; such pieces are commonly known as “Wolff” glass. Another follower of Greenwood was the painter and engraver Aert Schouman ( 1710-92). Greenwood, Wolff, and Schouman all mainly worked on glass thought to have been made in the factories around Newcastle-upon-Tyne in northern England, which made a soft glass that was better suited to the stippling technique than the more brittle soda glass.
WHEEL ENGRAVING
In wheel engraving, a mechanical wheel fed with an abrasive paste (typically a mix of oil and emery) is used
cut a design onto a glass surface. The technique, which has been used since Roman times, is best suited
thick-walled pieces, because the depth of the cut is an essential part of the design. The modern technique was probably developed between c.1590 and 1605, at the court of the Holy Roman Emperor Rudolph 11 in Prague, by the gem engraver Caspar Lehman 15-0-1622), who engraved plaques and beakers with portraits and allegorical subjects.
In Bohemia a new type of glass known as “lime” glass, in which chalk lime carbonate was added to the batch to give a strong, colourless crystal suitable for deep engraving, was developed c.1683. At about the same time water power was introduced to drive the wheels, and this also enabled deeper cutting. Especially notable is the work of Dominik Biemann (1800 1857), whose training at the Prague Academy of Drawing is reflected in his fine engraved portraits on beakers and medallions. Of particular note are the Baroque pokals lidded goblets) decorated with Hochschnitt (”high cut”) engraving by the Silesian Friedrich Winter (d.C. 17 12). One of Lehman’s pupils was Georg Schwanhardt the Elder 1601-70), who left Prague for Nuremberg where he established a workshop and founded a dynasty of skilled engravers, including his son Heinrich (1624l
The technique was further developed in the 19th century, as Bohemian craftsmen pioneered a process whereby glass was overlaid with a layer of glass in a different colour and then wheel engraved to show the design in the colour of the first laver. Two lavers of glass were standard, but sophisticated pieces were composed of up to four layers. Such pieces demanded great expertise, as each coloured layer cooled at a different rate, and with each additional colour the risk of cracking increased. Common decoration included forest and hunting scenes, rural views, and castles. However, most sought after are special commissions such as portraits of famous people, battle scenes, and important buildings. Highly skilled Bohemian craftsmen travelled across Europe, so many pieces of this type were produced in various countries.
Towards the end of the 19th century some fine wheel-engraved pieces with Hochschnitt and Tiefschnitt (incised or intaglio) decoration were designed by J. & L. Lobmeyr (est. 1823) in Vienna. The firm produced copies of 18th-century designs and worked in Classical and contemporary styles. Leading engravers who worked for Lobmeyr included Karl Pietsch ( 1826-83), Peter Eisert ( 1828-94), and Franz Ullmann (1846-1921 ).
Engraved glass was also produced in Sweden. In the 20th century some outstanding pieces were made at the Orrefors factory (est. 1898) in Orrefors, in the Sul Aland region. In 1916 Simon Gate ( 1883-1945) was brought in as a chief designer, and he was joined the following year by Edvard Hald (1883-1980). Gate’s designs typically feature elegant Neo-classical figures,
while Hald’s figures are more caricatured and are mostly shallow engraved. Between 1928 and 1941 Vicke Lindstrand ( 1904-83) also worked for Orrefors, producing stylish and elegant designs.
Diamond-point and stipple engraving
• CONDITION diamond-point engraving should be shallow, with ragged, slightly broken lines, minor damage will not greatly affect value of early pieces
• BEWARE copies were decorated by
enthusiastic
amateurs in the I 9th century; when dated there is no Confusion, but undated older glasses can be misleading
Marks
Diamond-point pieces may he signed on the foot or in the design
Wheel engraving
• TYPES OF GLASS 19th-century Bohemian coloured glass Was a popular base; this glass should feel heavy
• DECORATION late 18th-century pieces feature formal designs; heavy, ornate engraving is typical; high-quality pieces have elaborately cut, ornate feet

Enamelled glass
The process of enamelling has been known since Roman times, and from the end of the 13th century was used to great effect by Islamic glassmakers to decorate mosque lamps. In Europe enamelling first appeared in Venice in the 15th century, and spread elsewhere during the 16th century. In Vienna in the early 19th century beakers were decorated with transparent enamels
in the Biedermeier style by such artists as Gottlob Samuel Mohr and Anton Kothgasser and in the later part of 19th century copies of earlier styles were made by manufacturers all over Europe, the most outstanding of which were Islamic- and Iznik-style wares, which were made in France, and Histortsmus wares, which were produced in Germany.Enamelling
, which can be used to decorate both colourless and coloured glass, was used extensively in Europe from the 16th century. It was employed most notably to decorate armorial wares, but it was also used to create bright and colourful decoration in naturalistic motifs; naive and charming designs of flowers and animals are highly characteristic. On many wares enamelled decoration was used in conjunction with gilding.
ITALY
The invention of cristallo glass c.14.50 by Angelo Barovier (4.1460) provided a perfectly clear ground that was ideally suited to enamelling in brilliant colours. Enamelling, a technique that the Venetians probably learned from Islamic glassmakers, was at its peak in Venice from the 15th to the mid-16th centuries. The process involved applying a thick paste of powdered glass and a colouring metallic oxide in an oil medium to the surface of the glass, which was then heated in a furnace, where the enamel and glass fused. Each colour required a different firing temperature, and the work could easily burn if overfired. Enamelling is a notoriously difficult technique, and most enamelling of this period is
restricted to the borders, with simple scale and dot patterns. On much more sophisticated wares, such as specially commissioned commemorative tazze (ornamental serving dishes), enamelling was often combined with gilding, and decoration included portraits, coats of arms, family and guild crests, and mythological figures. Although enamelling fell out of favour by the late 16th century, it was revived during the second half of the 18th century by Oswaldo Brussa, who, with his son Angelo, decorated clear-glass beakers, carafes, and bottles with birds, flowers, and biblical scenes in a charming and naive style.
GERMANY AND BOHEMIA
In the 16th century enamelling was developed as a popular form of decoration in the regions of Germany and Bohemia. From the mid-16th century German glass decorators, inspired by finely decorated wares from Venice, used brightly coloured enamels to decorate large, simple shapes made from coarse, robust soda glass. The technique was especially popular for decorating traditional drinking glasses or goblets, particularly the Humpen (simple, cylindrical drinking vessels, the foot rims of which are decorated with white enamelled dashes). Variations on the Humpen include the Reichsadlerhumpen (”Imperial Eagle Beaker”), which was designed to toast and show allegiance to the Holy Roman Emperor, and featured the double-headed Imperial eagle with outstretched wings from which hang shields showing the constituent parts of the Empire; the Hofkellereiglas (decorated with armorial decorations), Wilkommhumpen (”greeting glass”), usually of large proportions, and Kurfturstenhumpen (”Elector’s beaker”), decorated with depictions of the Holy Roman Emperor and the Seven Electors of the Empire.
Other German drinking vessels that were enamelled Include goblets and beakers such as the Passglas (a tall cylindrical beaker decorated with horizontal bands, which indicated the amount of beer to be consumed by a drinker before they passed the glass on to the next person) and the Stangenglas (a long narrow beaker on a pedestal base). These wares were enamelled in very bright colours with decoration such as dated armorial and political motifs, Lind designs commemorating guilds and trades.
In Bohemia in the 18th century enamelling was mostly used to decorate flasks, bottles, and tankards made of opaque-white Milchglas (”milk glass”). The white body imitated porcelain, and the decoration featured people, animals, and flowers painted in a naive folk style in bright polychrome enamels.
In the 17th century Johann Schaper (1621-70),
a Hausmaler (”home painter”) based in Nuremberg, developed an enamelling techniques which he used to decorate both glass and porcelain. Schwarzlot (black-lead) enamelling involved decorating glass vessels (mainly tumblers) with black or brown transparent enamel, and was fashionable from c.1650 to 1750. Designs were typically inspired by engravings and depicted battle scenes, landscapes, and mythological subjects.
In the 18th century the popularity of Schwarzlot decoration spread to Bohemia and Silesia. One of the most celebrated exponents of the technique at this time was Ignaz Preissler (1676-1741), a glass and porcelain painter, who used the technique to decorate glass tumblers and flasks with mythological scenes, townscapes, Laub- and Bandelwerk (decoration of interwoven leaves and strapwork), and chinoiserie.
BRITAIN AND SPAIN
Before 17.50 enamelling was relatively rare in Britain. Among the best-known early British enamellers were the Beilby family. In 1760 William Beilby (1740-1819) and his sister Mary Beilby ( 1749-97) moved from Bilston, in Staffordshire, to Newcastle-upon-Tyne, in the north-east of England, where they enamelled wares between c.1762 and 1774. Their most celebrated wares are large pieces, Such as the “Royal Beilbys” – goblets featuring the Prince of Wales’s feathers and made from 1763 to commemorate the birth of the Prince of Wales (later George IV); their armorial goblets enamelled on the howl and commissioned by local families are also of note. Typical decoration includes simple borders of thinly applied white flowers, fruits, hops, and barley; more ambitious designs include Arcadian landscapes, ruins, and even sporting scenes.
Other British decorators who painted with enamels include-80) and Michael Edkins
,James Giles (1718
(173 1 34-18 11). Giles decorated glassware for the Falcon Glassworks (est. 1693) in London. Edkins, who worked
in Bristol, painted opaque white glass, both with chinoiseries and with charming, naive designs of insects, birds, and other naturalistic motifs.
In Spain enamelled glassware was produced most notably at La Granja de San Ildefonso near Segovia. Established in 1728 by the Catalan glassmaker Ventura Sit (d.1755), near the palace of La Granja, the factory employed French and German glassmakers, who brought with them a variety of techniques and styles that gave the glass an international character. Typical wares include glasses and tumblers, and although many were embellished with gilded decoration, enamelled floral designs, notably tulips and roses, were also popular.
Italy
• GLASS cristallo glass is most typical; some wares appear slightly cloudy due to Grizzling
• DECORATION many pieces feature naive folk art designs of flowers or biblical scenes; on some examples enamelling is used in conjunction with gilding
Germany and Bohemia
• GLASS Milchglas should be a slightly off-white colour
• COLOUR earlier, more collectable glass is often a smoky greyish-green colour; most later glass is a strong green
• DECORATION commemorative designs, rustic scenes, and flowers in bright colours arc typical
• CONDITION damage to enamelling can greatly reduce
the value; worn gilding is common but insignificant
• BEWARE be careful with .Schwarzlot glass that features transfer-printed decoration, as many reproductions were made in the 19th century
Britain and Spain
• GLASS glass is mostly clear, or sometimes blue or white
• DECORATION Britain: some wares by the Beilby family feature armorials; many pieces depict charming, naturalistic designs; Spain: floral designs, especially tulips and roses, arc highly characteristic; designs should be neat and well drawn; enamelling is often combined with gilded decoration
• COLLECTING Britain: “Royal Beilbys” and armorial goblets with coloured decoration are valuable and highly collectable
Styles of enamelled glass produced after 1800 are many and varied. In Germanic Europe (a region that included such cities as Prague, Vienna, Copenhagen, and Berlin) the period known as the Biedermeier period (c.1815–c.1848) was one of middle-class prosperity, and this ensured the continued popularity of such decorative arts as glassmaking. Enamelled wares from the early 19th century are typically decorated with topographical scenes, floral designs, and portraits in bright colours. Following the re-establishment of the German Empire in 1871 there was a revival of the production of traditional German styles of glass; this revival is known as “Historismus”. Exceptional enamelled wares were produced in France in the 19th century, notably elaborate Islamic designs and some delicately decorated opaline wares. In Britain enamelled decoration was mainly restricted to monochromatic transfer-printed patterns on opaque white grounds.
GERMANY AND BOHEMIA
During the Biedermeier period Samuel Mohn (1762-1815), a Hausmaler (”home painter”) in Dresden, pioneered the use of a thin, transparent enamel decoration, which he used to great effect on tumblers and beakers. His son Gottlob Samuel Mohn (1789-1825) learned the technique from his father and in c.1811 went to Vienna, where he
met Anton Kothgasser (1769-1851), a painter at the Royal porcelain factory. Both men used the technique to decorate simple, straight-sided beakers and,
from 1814, a type of beaker known as a Ranftbecher, with a waisted or tapered body and a thick cogwheel-cut base. Kothgasser’s enamelled decorations resembled romantic watercolours; his designs included fine landscapes,
cityscapes (particularly of Vienna), portraits, and allegorical and Neo-classical subjects. Mohn used silhouettes and allegorical subjects as decoration but is best known for his tumblers decorated with topographical motifs – palaces, cityscapes, and tourist views; his beakers typically have gilded borders. Other distinguished contemporary enamellers include Carl von Scheidt and Andreas Mattoni (1779-1864), 79-1864), who established a school at Karlsbad where Ludwig Moser (1833-1916) was a pupil.
Following the unification of Germany in 1871, there was a fashion for reproducing “historic” styles to create a sense of national identity; this trend (which also appeared in Italy in the mid-19th century) is known as “Historismus”. Glassware was just one of the media in which designs were reproduced in the “old German” style, characteristically with decorations of spurious crests, dates, and national insignia. There was a flood of traditional German drinking glasses made, including Humpen (simple, cylindrical beakers), Romer (drinking glasses with flared feet, wide cylindrical stems, and ovoid bowls), the Kuttrolf (a type of pouring flask), and other vessels made in imitation of 16th- and 17th-century originals, with false dates and inscriptions. These copies can usually be recognized by overelaborate decoration in bright, inappropriately coloured enamels, fictitious crests, crests of large towns rather than families, and heavy glass that is free from imperfections (early glass is frequently flawed). Wares, which are often of a very high quality and collectors’ items in their own right, may bear enamelled signatures identifying the manufacturer. The leading producers included the Rhenish Glasshouse (1886-92) in Ehrenfeld, Koln-Ehrenfeld, situated on the Rhine, near Cologne, and Meyrs Neffe of Bohemia (1841-1922) in Adolfov, known for producing copies of goblets with Hochschnitt (”high cut”) decoration during the 1890s. Hausmaler who worked on “Historismus” wares include Fritz Heckert, a glass enameller who established a glass-decorating works in Petersdorf, Bohemia, in 1866 and a glass factory in 1889. The company was active until c.1890 and specialized in the production of Humpen, enamelled with designs copied from traditional woodcuts and engravings. The strong Bohemian enamelling tradition was also continued late into the 19th century by such companies as Ludwig Moser & Sons (est. c.1857) in Karlsbad (now Karlovy Vary in the Czech Republic).
FRANCE AND AUSTRIA
In the 19th century French enamellers gained international renown for their fine wares, receiving
commissions from all over the world, particularly
from Arab states, in the Near East. Much French
enamelling was executed on the finest opaline
glass. Some of the best examples arc Vases
decorated with animals, birds, and sprays of
wild flowers. Some of the most impressive,
although quite rare, French enamelled wares
pre produced by Philippe Joseph Brocard
(4.1896) and I.J. Imberton Inspired by 13th-
and l4th-century Islamic lamps, which were
elaborately decorated with arabesques, stylized
scrolls, and floral designs in thick, opaque
enamel, Brocard experimented with this style
from the I 860s. His designs included copies
of mosque lamps, vases, ewers, and dishes;
these pieces, decorated with thick enamelling,
jewelling, and gilding, won first prize at
the Paris Exhibition of 1878. Imberton also
decorated fine Islamic-style wares with stylized
motifs. In Austria the style was taken up by
the glass company of J. &’ L. Lobmeyr- (est. 1823) in Vienna, which designed a range of Islamic style glassware for the domestic and export market, and also won prizes for its Islamic-style wares at the Paris Exhibition of 1878.
BRITAINIn
Britain the firm of W.II.., B. Richardson (est. c. 1836) near Stourbridge, was famous lot- it, high quality wares and patented designs. It produced glass using many patented techniques. One was known as “vitrified colours”, the finest examples of which were shown at the Great Exhibition of 1851 in London. The commercial process involved transfer printing [)lack or coloured designs such as a pictorial scene onto the glasse
hebody
(which was i opaque:), and then firing the design. Sometimes the enamels were hand-painted onto the body, although this is not so common. The firm of Bacchus (est. c.18 16; later George Bacchus & Sons) in Birmingham also produced a series of wares in the 19th century, which were decorated with transfer-printed enamels, most of which feature Neo-classical scenes.

Coloured glass
Coloured glass is made by adding metallic oxides to the glass batch. This technique was widely practised in ancient Egypt and Rome, where brightly coloured glass was often favoured over clear glass. In the 15th century opaque white glass, slightly translucent glass, and glass in imitation of hardstones were produced in Venice; in Bohemia glass in bold colours of blue and
ruby-red was widely produced before 1800. In the 19th century, with advanced technical and mass production methods production was much more widespread with notable firm operating not only in Italy and Bohemia but also in Britain France, and the USA. Experimention with new staining any overlay techniques produced a wide array of coloured designs.
EARLY GLASS
The Egyptians experimented with coloured glass, exploiting their extensive trade routes to acquire the necessary materials. Ancient Egyptian glass comes in a myriad of bright, pure colours. One of the most common was bright turquoise blue, coloured by adding copper oxide to the batch. Antimony and tin oxide, imported from Assyria, were used to colour glass an opaque white, while pure opaque yellow was trailed over dark blue core-formed objects, with white or pale blue, and
combed into festoons or feathery patterns and zigzags. Fine alabastra (bottles or flasks) known as “gold-band” incorporate stripes of real gold.
The Romans continued to experiment with coloured glass, producing most famously dark blue glass overlaid with opaque white and cut with cameo decoration. Mosaic glass was made from brilliantly coloured canes of glass cut into tiny slices and fused together in a mould. Most coloured glass was blue, although purple and amber pieces are also found. Much excavated Roman glass will have an iridescent surface; this is the result of a chemical reaction with the metal oxides in the earth after the glass was buried. Roman wares include bowls, bottles, flasks, and cups.
VENETIAN GLASS
From the mid-15th century the sophisticated know-how of Venetian glassmakers gave rise to many different types and effective combinations of coloured glass. In the late 15th century a “milky” opaque-white glass made by adding tin oxide to the batch was developed. This glass (known as lattimo in Italy) resembled porcelain, and it became particularly popular in the late 17th and early 18th centuries, when imported Chinese porcelain was in vogue. From the late 15th century a fine marbled glass known as “chalcedony” ” or “agate” glass was created by mixing together coloured opaque metals to resemble hardstones. Opaline glass, which was slightly translucent and less dense than opaque-white glass, was probably first made in Venice in the 17th century by the addition of oxides and the ashes of calcified
bones to the batch; when held to the light it can be distinguished from opaque-white glass by a red or yellow tint, which is known as the “fire’
BOHEMIAN GLASS
In the 16th century a distinctive dark-blue glass was produced in Bohemia by the addition of cobalt oxide. The clear vivid body colour was a perfect canvas for the brightly coloured naive enamelling popular at that time. At the end of the 17th century a deep pink glass was invented by by Johann Kunckel (c.1630-1703), a chemist and director at the Potsdam Glasshouse (est. 1679). The colour was produced by adding gold chloride to the batch. This “gold-ruby” glass (known as “Kunckel red” or, in German, Rubinglas or Goldrubinglas) was also produced in Nuremberg and other glasshouses in southern Germany. Gold-ruby glass was decorated with engraving, cutting, or gilding, and was considered a luxury product.
• MAIN AREAS OF PRODUCTION ancient coloured glass was made in Egypt and Rome; it was produced from c.1450 in Venice and from the 16th century in Bohemia
• TYPES blue glass; porcelain-like “milk” glass; coloured glass in imitation of hardstones; opaline glass; gold-
ruby glass
• FORMS densely coloured pieces may appear heavy bodied
• COLOURS ancient glass: many pieces have dark blue bodies sometimes with yellow and white decoration
• COLLECTING ancient Egyptian glass is very rare and valuable; generally colour will not play an important part in its value; gold-ruby glass is rare and valuable
Bohemia
The 19th century was an age of experimentation in glass technology. Glassmakers, some of whom were also skilled chemists, developed new colours, new ways of applying colour, and innovative techniques to produce glass
The most celebrated types of Bohemian glass from this period are “Lithyalin”, “Hyalith”, stained, and flashed glass.
LITHYALIN AND HYALITH GLASS
Count Georg Franz August Langueval von Buquoy 1811-1851), the owner of a number of glasshouses in southern Bohemia, produced an opaque black glass c.1817, which was inspired by the black basalt wares produced from the end of the 18th century at the Wedgwood factory (est. 1769) in England. In 1819 lie produced another dense opaque glass, known as -Hyalith”, usually in sealing-wax
red or jet-black. Hyalith was usually decorated with gilding.
Von Buquoy’s experiments may have inspired Friedrich Egermann (1777-1864), who in 1829 at his factory in Haida, northern Bohemia, patented “Lithyalin” glass, a polished opaque glass that resembled hardstones, which he continued to produce until 1840. The surface of the glass was brushed with metal oxides to resemble veining and marbling. Strong colours are typical, especially red; more unusual are dark-green, blue, and purple. Wares were usually cut and polished and occasionally gilded or enamelled. Lithyalin glass was used mainly
~, vases,
for purely decorative items, notabl
and scent bottles. Lithyalin glass was also produced at the Harrach Glassworks (est. 1`14) in Neuwelt (now Novy Svet in the Czech Republic), and by Hautin & Co. in France. Although these copies are difficult to distinguish from pieces by Egermann, they are usually slightly lighter in colour.
STAINED, FLASHED, AND OVERLAY GLASS Egermann also invented an effective and inexpensive method of colouring glass with a
thin stain of colour, which was called flashing. This involved painting a clear object with a stain and firing it at a low temperature to fix the colour. This gave a solid, even, pale colour. Egermann is particularly noted for his yellow coloured stain, developed in 1818 using silver chloride, and his ruby-red stain, perfected in 1832, using gold
chloride and copper oxide. Wares were often cut through to the thin colour to reveal the clear glass beneath.
In casing – a technique reinvented by Egermann –the glass vessel is covered in a differently coloured glass and then fired; as the glass cools, the two layers fuse together. Some pieces were “double-cased”, i.e. dipped into two differently coloured batches of glass to give a multicoloured effect. The flashing technique is sometimes confused with casing as the terms were used interchangeably by some glassworks; however, in casing the layers of glass are much thicker. If there is a sharp line between the two colours, this suggests flashing, whereas shading or thinning between two colours suggests overlay. Flashing and staining are characteristic of 19th-century Bohemian glassmakers as they are inexpensive methods of colouring glass and thus well suited to the mass-produced wares made during the 19th century.
OTHER COLOURED GLASS
During the 1820s and 1830s a series of
industrial exhibitions held in Prague gave rise to the development of other types of coloured glass, including violet, pink, green, and blue. Further experimentation with colour in the early
I 9th century sparked the discovery in Bohemia of other ways to colour glass. Of particular note is the work of Josef Riedel (active 1830-48), who in the 1830s used uranium to produce a vivid fluorescent greenish-yellow (Annagriin) and yellowish-green (Annagelb) glass, both named after his wife Anna. However, this glass was mildly radioactive, and the process was later abandoned.
Lithyalin and Hyalith glass
• CONDITION ceramic restoration techniques are often used, so repairs can be difficult to spot
• COLLECTING display vessels such as vases and bowls arc most common; display cups and saucers and pieces with gilt oriental and chinoiserie decoration are rarer; lithyalin overlaid on dark-green hyalith is valuable
Flashed, stained, and overlay glass
• CONDITION check pieces carefully, as damage is often hard to detect on coloured glass; good condition is vital
• COLLECTING the condition and depth of the colour determine the value; beware when collecting blue stained glass as it fades easily and can lose value
Other Bohemian coloured glassTYPES
• vivid green Annagriin and Annagelb glass
Britain, France, and the United States after 1800
Coloured glass was widely produced during the 19th century in Britain, France, and the USA. In Britain two important events gave a new impetus to the manufacture of coloured glass in the middle of the century. The first was the removal of excise tax on glass in 1845, which encouraged makers to experiment with new techniques and styles, among them coloured glass. The second was the Great Exhibition held in London in 1851 at which glassmakers from Europe and the USA were keen to show their new skills and techniques. In France glassmakers at all the major factories manufactured coloured glass in a range of styles and forms, and in the USA firms experimented widely with colour, producing an extensive range of designs, most characteristically in delicate pastel shades with subtle
BRITAIN
All blue, green, and amethyst glass produced in Britain from the end of the 18th to the middle of the 19th century is generically described as “Bristol” glass. The most characteristic colour is a brilliant royal blue, produced by adding cobalt oxide to the batch; such glass is frequently embellished with cold gilding. Drinking glasses were generally green, ranging from grass green to a turquoise green. Amethyst glasses are rare, but when found the colour is true and clear, with no sign of red, unlike the plum tone found on later Victorian glass.
In the mid-19th century the influence of coloured glass manufactured by well-established glass companies in Bohemia became increasingly visible in the products of British factories. Not only did important Bohemian factories such as the Harrach Glassworks (est. 1714) in Neuwelt (now Novy Svet in the Czech Republic) exhibit quantities of coloured glass at the Great Exhibition, but Bohemian glassworkers were also employed by British factories where, freed from the constraint of having to produce wares in traditional styles, they were able to manufacture very exciting wares in an outstanding range of new colours.
In the late I 870s a type of
type
opalescent glass, known as
“Vaseline” glass due to its greasy,
vaseline-like appearance, was developed
in Britain and designed to resemble 15th-
and 16th-century Venetian glass. The opalescent colour was produced by using tiny amounts of uranium together with other metal oxides to create shades of yellow, green, blue, and, more rarely, red. Stevens & Williams Ltd (est. 1847), of Brierley Hill, near Stourbridge, was one of the leading innovators in the field of patent colours and colour combinations in the late 19th and early 20th centuries. The company’s rare double-cased “Rockingham” ware is particularly sought after, as are the Bohemian-style
pieces with alternating panels of engraved colour-flashed and clear glass produced by WIT.,
B. & J. Richardson (est. c.1836), also near Stourbridge. Amber was the most commonly used colour for the vases, decanters, and claret jugs in this style, although some pieces were also produced in purple, green, and red.
Gold and uranium oxides combined with sodium nitrate were used to manufacture the “Queen’s Burmese” range of glass by Thomas Webb & Sons (est. 1837), near Stourbridge, patented in 1886. Queen’s Burmese was inspired by the “Burmese” glassware patented in 1885
by the Mount Washington Glass Co. (est. 1837), in South Boston, Massachusetts, and favoured by Queen Victoria who ordered a set – hence the name. It had a body colour that shaded from a pale lemon-yellow (sometimes light green) at the bottom through to salmon-pink at the top. Some pieces feature enamelled and gilded designs. Although Queen’s Burmese ware was made by other British companies – including WIL, B. & J. Richardson –pieces by Webb are the most desirable. Typical wares include vases, posy bowls, and lampshades. Another type of glass introduced by Webb was “Peach” glass, a type of cased glass that shaded from pink through to a deep red.
A Tazza
The tazza is a distinctive Venetian form of serving dish. The revival of 15th- and 16th-century Venetian glass forms and styles of decoration was started in Venice during the mid-19th century and gradually spread throughout Europe. In Britain the Revival was supported by William Morris, who disapproved of the heavily cut glass prevalent at the time. One of the leading British manufacturers of Venetian Revival glass was James Powell & Sons (est. 1834), which produced “Vaseline” glass wares similar to the example shown above, and in delicately tinted glass from the 1870s.
FRANCE
In France, the Baccarat Glassworks (est. 1764 as the Sainte-Anne Glassworks) in Baccarat, near Luneville, Lorraine, produced glass c.1880 in a distinctive, delicate shade of pink known as “tinted-rose”.Many
wares feature acid-etched Classical decoration. Another fashionable trend was the production of coloured opaline glass, a semi-opaque white glass, opacified by the addition of the ash of calcined bones and coloured with metallic oxides. The Venetians had been the first to introduce this translucent glass, which was later made in Bohemia and Britain, but the French opaline glass first produced c.1823 at Baccarat was more translucent. The finest French opaline was made at Baccarat, at the Saint-Louis Glassworks est. 1767) near Bitche, in the Munzthal, Lorraine, and at the Choisy-le-Roi Glassworks (est. 1821) in Paris. Wares were made in delicate pastel shades such
as turquoise, pink, and pale green, and include pairs Of vases with enamelled decoration, and vases, jugs, and dishes of inventive forms, often with coloured cane rims. Saint-Louis Glassworks made many pieces IT soft pink or blue, with latticinio decoration and glass cane rims.
THE UNITED STATES
Throughout the 19th century American glass manufacturers launched and developed a range of innovative coloured glass. One of the most popular and now widely collected colours is the transparent “Cranberry” glass, which has a distinctive raspberry pink tint, first produced in the glassmaking region of Stourbridge in England. Huge quantities of useful and ornamental wares were made, most notably at the Boston & Sandwich Glass Co. (1826-88) in Sandwich, Massachusetts.
However, it was only during the 1880s, when there was a move away from cut and pressed glass by the leading glass manufacturers, that they began to experiment in earnest with a more sophisticated range of coloured art glass. One of the leading companies at this time was the Mount Washington
Glass Co., which launched the widely copied and enormously popular “Burmese” glass in 1885. Most Burmese glass has a satin finish, although some has a glossy surface, and is characterized by subtle gradations of shading from a light lemon at the bottom of the piece to a delicate pink at the top. In 1883 the firm of Hobbs, Brockunier & Co. (est. 1863) in Wheeling, West Virginia, developed “Peachblow” glass and incorporated it into its range of coloured wares. This cased glass is a warm buttery yellow at the base shading through to a purplish-red at the top and is lined in a white opal glass. Peachblow was made at other companies, including the New England Glass Co. (1818-90), originally in East Cambridge, Massachusetts, which called it “Wild Rose”. New England was also notable for its “Amberina” range of glass, which it produced as “Pressed Amberina”. Both Wild Rose and Pressed Amberina were developed by Joseph Locke (1846-1936), an English glassworker, who emigrated to the USA in 1882. Patented in 1883, Amberina glass contained small amounts of gold, and graduated from pale amber at the base through to a rich fuschia at the top. It was made until 1900. Hobbs, Brockunier & Co. also made Pressed Amberina under licence from the New England Glass Co.
France
• MAJOR FACTORIES Baccarat, Saint-Louis, Choisy-le-Roi
• TYPES pastel-coloured opaline glass and wares with decoration are most notable
• COLLECTING wares by Baccarat are sought after
Marks
Saint-Louis: this mark was used from 1870 to the present day; some pieces marked “Argental” or Munzthal the German for Argental, often with a tiny cross of Lorraine
The United States
• COLLECTING Cranberry glass: very popular with
collectors; later Cranberry tends to have a less warm hue and a bluey tinge when held to the light
Marks
Mount Washington Glass Co.: mark used on Burmese ware from the 1880s
New England Glass Co.: Amberina ware; mark used from 1880s
Britain
• TYPES Bristol glass, overlay glass, Vaseline glass, decorated opaque and opaline glass
• BEWARE there are many early 20th-century copies of Bristol glass: beware of glasses that are larger than usual (more than c. I Ocin/4in high) and thin glass
Marks
Thomas Webb & Son