Improvements in Processes for Producing Stained Glass Imitation.
Year: 1893

page_text: Date of Application, 12th Dec., 1893-Accepted, 4th Aug., 1894
COMPLETE SPECIFICATION.
Improvements in Processes for Producing Stained Glass Imitation.
I, ERNST EMIL PILZ, Sole Proprietor of the Firm of Gebruder Pilz, Art
Printers and Lithographers, residing at Schlettau in the Kingdom of Saxony,
German Empire, 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 the present invention is to produce diaphanie pictures, transparent
pictures in imitation of stained glass, which shall however possess all the advantages
The
of the latter and consequently form a really efficient substitute for the same.
diaphanie pictures hitherto in use consist of a transparent paper picture, mounted
between two glass panes, in order to protect the said picture as much as possible.
This method of protection is however in many respects insufficient, particularly
against atmospheric influences, to which for the most part the cracking of the
pictures is due.
By my improved process hereinafter set forth I mount the same in such manner
that they are entirely impervious to atmospheric influences, and in addition to this
however possess the following advantages in comparison with the pictures of the
kind hitherto in use.
The pictures produced according to my process, possess the plasticity of colour
peculiar to stained glass, which is entirely wanting in the ordinary diaphanies, they
also possess the peculiar reflecting property of stained glass and are better able to
resist the deteriorating influence of light which so soon becomes noticeable in the
ordinary diaphanies.
The process is performed in the following manner :—
The pictures, which may be produced by photographic, lithographic or any other
multiplying process, are mounted on a paper previously coated with an easily
soluble layer such as dextrine, gum or the like. The colours employed for the
pictures must be suitably prepared, as the same being without body, must be
capable of drying up quickly, to form a thin coating of colour. After this coating
or membrane of colour has been formed, the glass on to which the picture is to be
transferred, is thoroughly cleaned and covered with a coating of gelatine, by means
of which the picture is caused to adhere to the same. The picture is now laid on
the glass with the paper uppermost and all air carefully pressed out from between
the same and the glass. The whole is then placed in cold water to dissolve the
dextrine or other coating and enable the paper to be removed from the picture,
without damaging the latter. By lightly washing the glass the last traces of the
dextrine will be removed and the picture should now be allowed to dry.
The pictures produced according to this process are very transparent, as those
parts of the same not coloured remain perfectly clear and transparent.
After the picture has been allowed to thoroughly dry, it is coated with a layer
of some composition, capable of rendering it impervious to the influences of the
atmosphere. Such composition may for instance consist of a solution of pyroxylin
in various solvents, particularly such as produce a brilliant or glossy effect on the
colours, as also various alcohols. To the solutions are further added such
ingredients as are capable of effecting an intimate combination of the pyroxylin
5 solution with the film of colour, such as balsams, volatile, resinous vegetable
excretions.
This coating has the advantage over the extra pane of glass hitherto employed,
that it does not alter the picture in any way allowing the plasticity of the colours
to be displayed to the greatest advantage.

page_text: Having now particularly described and ascertained the nature of my said inven-
tion and in what manner the same is to be performed I declare that what I
claim is :-
A process for producing stained glass imitations consisting in first imprinting a
picture or representation produced by any of the known multiplying processes, on
paper previously coated with an easily soluble adhesive then transferring the
picture on to glass, which has been previously coated with a layer of gelatine, and
finally covering the transferred picture, with a transparent coating, possessing the
quality of rendering the picture impervious to the atmospheric influences, without
however marring its effectiveness, substantially as described and for the purpose
specified.
Dated this 19th dor of December 1802
66
CASTLE SMITH,
Invention" Office, 54, Fleet Street, London, E.C.,
Agent for the Applicant.