Improvements in the Manufacture of Colored Dry Plates for Photography.
Year: 1894

page_text: Date of Application, 1st Sept., 1894
Complete Specification Left, 25th June, 1895-Accepted, 24th Aug., 1895
PROVISIONAL SPECIFICATION.
Improvements in the Manufacture of Colored Dry Plates for
Photography.
I. EMILE DE CONINCK of 91 Maisons aux Aiguilles Ghent, in the Kingdom of
Belgium, Manufacturer of Photographic Plates, do hereby declare the nature of
this invention to be as follows:-
The novelty of this invention consists
(1.) In making the color of the product foreign to the normal color of the
material which is sensitive to the light, this entirely artificial coloring being
obtained by the addition of coloring substances, either to the sensitive material
itself, or to the different kinds of supports on which it may be spread.
(2.) In making the coloring permanent and capable of enduring all necessary
manipulation.
(3.) In the effective character of the results produced as regards (A) the nature
of the plates themselves which attain greater sensibility and transparency, and
(B) in the preparation of proofs, which is greatly facilitated.
Dated this 1st day of September 1894.
S. S. BROMHEAD,
97 Newgate Street, London, Agent for Applicant.
Improvements in the Manufacture of Colored Dry Plates for
Photography.
1, EMILE DE CONINCK of 91 Maisons aux Aiguilles, Ghent in the Kingdom of
Belgium, Manufacturer of Photographic Plaques, 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 novelty of this invention consists―
(1.) In making the color of the product foreign to the normal color of the
material which is sensitive to the light, this entirely artificial coloring being
obtained by the addition of coloring substances either to the sensitive material
itself or to the different kinds of supports on which it may be spread.
(2.) In making the coloring permanent and capable of enduring all necessary
manipulation.
(3.) In the effective character of the results produced as regards (A) the nature
of the plates themselves, which attain greater sensibility and transparency, and
(B) in the preparation of proofs which is greatly facilitated.
The system has this novel and hitherto unknown peculiarity of the plates being
and remaining freely colored.
These plates are made of glass, colored in different tints, and coated with a very
thin and level layer of gelatine.
They are allowed to dry and are then sensitised by bromide of silver. The tints
can also be obtained by indelible coloring substances, which have no action on the
[Prins 811

page_text: gelatine layer, and which are added thereto at the moment of applying it to the
glass. In this case the glass is not colored.
The coloring of my plates is permanent and indelible and remains after all
the manipulation to which they are submitted.
The coloration of the plates has a grand influence both on the nature of the
plates, of which they modify the qualities, notably the sensibility, transparency
and mellowness, according to the coloring employed, and the results, which are
desired; and also on the pulling of proofs for printing by the aid of clichés made
upon colored plates, which permit results to be obtained unattainable with ordinary
plates.
Having now particularly described and ascertained the nature of my said
invention, and in what manner the same is to be performed, I declare that what
I claim is
Colored dry plates for use in photography, prepared either with colored glass, or
of uncolored glass to which a very thin and level layer of gelatine is applied, which
is sensitised by bromide of silver after drying, and to which is added in the second
case at the moment of application, indelible colors having no action on the gelatine,
as herein described and explained.
S. S. BROMHEAD,
97 Newgate Street, London, Patent Agent.