Photographs upon Glass and like Substances.
Year: 1888

page_text: Date of Application, 11th June, 1888
Complete Specification Left, 11th Mar., 1889
Complete Specification Accepted, 13th Apr., 1859
Photographs upon Glass and like Substances.
We, AUGUSTE EMMANUEL LETALLE of Mary Street, Balsall Heath, in the County
of Worcester, Photographic Artist, and FREDERICK BILLING of Livery Street,
Birmingham, in the County of Warwick, Manufacturer, do hereby declare the nature
of this invention to be as follows:-
It is well known that alkaline chromic salts, such as bicromate of potash, prevents
gelatine from swelling, when treated with cold water, or to be dissolved, or made
soluble in warm water, when light has acted upon the gelatine film.
Several photographic processes, are based on the aforesaid properties of swelling and
dissolving in water, such for example, as the Woodbury-type, Collo-type, and also
carbon printing and which said processes, make use of, or employ, a photographic
negative, in order to render the gelatine, insoluble, in the parts where the said negative,
had allowed light to pass through.
In the Woodbury-type process, the washing away of part of gelatine not rendered
insoluble by light, is also done in carbon printing, and in the Collotype process, in
not washing away in hot water, the gelatine not insolubitised by light, but in
swelling in cold water for repulsing the greasy ink with which the gelatine is rolled
over, to produce a picture, as is done in lithography
By our invention, coloured photographs on glass, is produced, by covering a plate
of glass, (or other such like plate) with gelatine, sensitised for the light, with a salt of
chrome, and exposing the said prepared plate, under a positive, instead of a negative,
as in the processes herein before mentioned.
The salts of chrome thus employed, are then washed away, and the plate dryed, and
afterwards immersed in a bath of dye.
The parts of the plate not hardened by the exposure to light, absorbs or takes up the
dye, and produces on the surface of the glass, (or other transparent substance,) a
photographic picture, in the color of the dye used. The plate thus treated, is then
immersed in a bath of alum, to fix it, and then afterwards left to dry.
n
1

page_text: Thus, the process of producing photographs upon glass according to our invention,
consists essentially in employing dyes in connection with gelatine films, or rather those
parts of gelatine films, not hardened by light under a positive.
Our invention also consists further, in the use of dyes, in connection with gelatine
film covered plates, made sensitive to light, by iron perchloride, and tartaric acid, and
with the said plate placed under a negative, instead of a positive.
Our invention is applicable for the reproduction of drawings, works of art, portraits
from life, scenery photographed from nature, advertising tablets and printings, colored
glass and for other purposes.

page_text: Photographs upon Glass and like Substances.
We AUGUSTE EMMANUEL LETALLE of Mary Street Balsall Heath in the County of
Worcester, Photographic Artist and FREDERICK BILLING of Livery Street Birmingham
in the County of Warwick, Manufacturer do hereby declare the nature of this inven-
tion and in what manner the same is to be performed, to be particularly described and
ascertained in and by the following statement
-
It is well known, that alkaline Chromic salts such as bichromate of Potash prevents
gelatine from swelling when treated with cold water, or dissolved, or made soluble in
warm water, when light has acted upon the said gelatine or a film thereof.
water
,
Several photographic processes are based on the aforesaid properties of swelling, and
dissolving in
the Woodbury-type, Collo-type and carbon printing
processes make use of or employ, a photographic negative in order to render the
gelatine insoluble, in the parts where the said negative, had allowed light to pass
through.
In the Woodbury-type process, the washing away of part of gelatine not rendered
insoluble by light, is also done in carbon printing, and in the Collotype process in not
washing away in hot water, the gelatine not insolubitised by light, but in swelling in
cold water, for repulsing the greasy ink with which the gelatine is rolled over, to
produce a picture, as is done in lithography.
Our invention consists in producing colored photographs, upon glass, opal, china
and other like substances.
According to one part of our invention colored photographs are produced, by
covering the aforesaid substances, or a part of the surfaces thereof, with a film of
gelatine sensitised for light, with a salt of chrome, and exposing the said sensitised,
and prepared film, under a transparent positive, instead of under a negative, as in the
preceding processes, as herein before referred to.
Thus, for example, a plate of white opal glass is taken, and one side thereof, covered
or coated with a gelatine film, sensitised for light, by a salt of chrome
This plate is
now exposed under a transparent positive, and then placed in a bath of cold water, and
the salts of chrome thus employed, washed away. The plate is then dried, and sub-
sequently immersed in a bath of dye, containing a large proportion of glycerine (about
one half)
The parts of the film or surface not hardened by the exposure to light, absorb
or take up the dye, and produces a photographic picture in the color of the
dye used.
The surface of the plate thus treated, is then immersed in a bath of alum, and left
to dry.
Thus, the process, or the combination of processes, in the production of photographic
pictures on the surfaces of the materials as aforesaid, and according to our invention,
consists essentially, in employing dyes, in connection with gelatine films, or rather
those parts not hardened by light under a positive.

page_text: According to another form of our invention, we use dyes, in connection with gelatine
films as before described, but sensitised with perchloride of iron and tartaric acid, and
with the said prepared and sensatised surface, placed under a negative, instead of a
positive.
The plates are dried in a warm room at about 120 degrees Fahrenheit.
The dye solution is made by putting the coloring matter (which must be
soluble) either in pure water, or in water and methylated spirit, with or without
glycerine, gum arabic, or other bodies of a like nature, or constitution added.
Our said invention is eminently adapted for the reproduction in color of drawings,
works of art, portraits from life, landscapes and other scenery from nature, advertise-
ments, tablets, colored windows, and for all other purposes, where ordinary photography,
has been applied.
The surface substances upon which the photographs are reproduced, may be of any
color desired.
Having now particularly described and ascertained the nature of our said inven-
tion, and in what manner the same is to be performed, we declare that what we
claim is :-
First: The production of colored photographic pictures, by employing dyes or
stains in connection with gelatine films, or rather those parts hardened by light under
a transparent positive, as set forth
Secondly:The production of colored photographs upon glass, china and other like
substances, by employing dyes or stains, in connection with gelatine films, sensitised
for light, by a salt of chrome, and exposed under a transparent positive; and which
said process of production, or the combination of processes, is or are conducted, or
carried out, in manner, and by means, substantially as set forth, in the first part of
our invention.
:-
Thirdly The production of colored photographic pictures, upon glass, and other
like substances by employing gelatine films sensitised for light with perchloride of iron,
and tartaric acid, and placed under a negative, substantially as described in the second
part of our invention.
DL: L
C 1 1000