Year: 1895

page_text: Date of Application, 30th Mar., 1895
Complete Specification Left, 10th Dec., 1895-Accepted, 15th Feb., 1896
I, FRITZ SCHACHINGER, Manufacturer, of Neuhauserstrasse 14, Munich in
the Empire of Germany, do hereby declare the nature of this invention to be as
follows
The object of this method is to produce, with the aid of photography, indelible
pictures upon glass.
This object is reached by applying an absolutely uniform, gray coating to the
glass plate. This coating having been sufficiently exposed to light is coloured with
chemical enamel colours which are burnt in and annealed in the usual way.
The gray uniform coating is produced in the following manner.
Glue and
gelatine, which latter, mixed with about 5 to 20 per cent. ammonia, is boiled in order
to add to its capacity to dissolve, are mixed in about equal parts and then dissolved
in water. To this mixture is added chromate of potash, chromate of ammonia or a
mixture of both in a proportion of about 3 to 10 grammes of chromate of ammonia
or 5 to 25 grammes of chromate of potash to one litre of the liquid, and to produce
a lighter or darker gray, the respective quantity of ceramic black colouring matter.
The latter is first, in order to obtain a very fine pulverized colour, rubbed down
with turpentine and then dried.
The liquid prepared in the above described manner is either used for direct
coating of the glass plates, or it may be put on paper etc. and from there trans-
ferred to the glass plates so that a uniform coat is formed on the latter which is
afterwards dried. On this coat the picture is produced by exposure to light under
a photographic half-tone or other negative and washing the exposed plate in warm
water. To obtain absolute insensitiveness to light, it is necessary, before the glass
plate is put into the oven, to wash out the chromate combinations with sulphuric
acid or any other equivalent means.
This so prepared gray photographic picture after being coloured with ceramic
colours is burned in the known manner.
Dated this 30th day of March 1895.
HERBERT HADDAN & Co.,
Agents to the Applicant.
I, FRITZ SCHACHINGER, Manufacturer, of Neuhauserstrasse 14, Munich, in the
Empire of Germany, do hereby declare the nature of this invention and in what
manner the same is to be performed to be particularly described and ascertained in
and by the following statement :-
The object of this method is to produce, with the aid of photography, indelible
pictures upon glass.
This object is reached by applying an absolutely uniform, gray coating to the
glass plate. This coating having been sufficiently exposed to light under a negative
Price 8d.l

page_text: or equivalent light shield and developed will serve as a basis or design which may
be colored with chemical enamel colors which are burnt in and annealed in the
usual way.
The gray uniform coating is produced in the following manner, Glue and gelatine,
which latter mixed with about 5 to 20 per cent. ammonia is boiled in order to add
to its capacity to dissolve, are mixed in about equal parts and then dissolved in
water. To this mixture is added chromate of potash, chromate of ammonia or a
mixture of both in a proportion of about 3 to 10 grammes of chromate of ammonia
or 5 to 25 grammes of chromate of potash to one litre of the liquid; and to produce
a lighter or darker gray the corresponding quantity of ceramic black coloring
matter. The latter is first in order to obtain a very fine pulverized color, rubbed
down with turpentine and then dried. The liquid prepared in the above described
manner is either used for direct coating of the glass plates or it may be put on
paper etc. and from there transferred to the glass plates so that a uniform coat is
formed on the latter which is afterwards dried. On this coat the picture is produced
by exposure to light under a photographic halftone or other negative and washing
the exposed plate in warm water. To obtain absolute insensitiveness to light it is
necessary before the glass plate is put in the oven to wash out the chromate
combinations with sulphuric acid or any other equivalent means.
This so prepared gray photographic picture after being colored with ceramic
colors is burned in the known manner.
Having now particularly described and ascertained the nature of this said inven-
tion and in what manner the same is to be performed I declare that what I
clain is :-
The new method of producing indelible pictures upon glass suitable for glass
painting or staining consisting in applying to the glass plate an emulsion composed
of solution of glue and gelatine, the dissolving faculty of which may be added to by
its being boiled with ammonia together with chromate of potash or of ammonia or
the like and a ceramic black color, exposing the same to light under a negative or
light shield of the design required, developing the image by the use of lukewarm
water and removing the chromate combinations in order to obtain picture or design
of a uniform gray color upon which ceramic colors may be painted and which may
be burnt in in the usual way.
Dated this 10th day of December 1895.
HERBERT HADDAN & Co.,
18, Buckingham Street, Strand, London, W.C.,
Agents to Applicant.