A Process for Colouring Paper and Cardboard.
Year: 1893

page_text: Date of Application, 22nd Apr., 1893
Complete Specification Left, 12th Jan., 1894-Accepted, 17th Feb., 1894
PROVISIONAL SPECIFICATION.
A Process for Colouring Paper and Cardboard.
I, FRANCIS Ross WELLS, of The Chase, Southgate, in the County of
Middlesex, Gentleman, do hereby declare the nature of this invention to be as
follows:
This invention relates to a process for colouring paper and cardboard in such a
manner that the colour is not affected by water or spirit being applied thereto.
For this purpose the colouring matter with which the paper or cardboard is to be
coloured is mixed with gelatine glue or size, starch, dextrine gum or other sizing
matter which is affected by chromium salts and a solution of one of the chromium
salts, such as potassium dichromate, sodium dichromate, ammonium dichromate or
chrome alum. This mixture is then either applied to the surface of the paper or
cardboard or it may be incorporated with the paper pulp during manufacture of
the paper or cardboard.
Or the paper may be first coloured with the mixture of colouring matter and
sizing matter and be subsequently treated with a solution of the chromium salts.
The paper or cardboard should be exposed to light or kept for some time
before use.
Dated this 22nd day of April 1893.
ABEL & IMRAY,
Agents for the Applicant.
COMPLETE SPECIFICATION.
A Process for Colouring Paper and Cardboard.
I, FRANCIS Ross WELLS, of The Chase, Southgate, in the County of
Middlesex, Gentleman, 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:-
This invention relates to a process for colouring paper and cardboard in such a
manner that the colour is not affected by water or spirit being applied thereto.
For this purpose, the colouring matter, with which the paper or cardboard is to
be coloured, is mixed with gelatine, glue or size, starch, dextrine gum or other
sizing matter which is affected by chromium salts and a solution of one of the
chromium salts, such as potassium dichromate, sodium dichromate, ammonium
dichromate or chrome alum. This mixture is then either applied to the surface of
the paper or cardboard, or it may be incorporated with the paper pulp during
manufacture of the paper or cardboard.
Or the paper may be first coloured with the mixture of colouring matter and
sizing matter and be subsequently treated with a solution of the chromium salts.
The paper or cardboard should be exposed to light or kept for some time
before use.
The proportions of the materials employed are necessarily varied according to
the character of the colours and the intensity of the tints or shades desired.
In practical operation the proportions are best determined by trial of samples.

page_text: Having now particularly described and ascertained the nature of this inven-
tion and in what manner the same is to be performed, I declare that what I
claim is :-
A process for colouring paper or cardboard by applying to it or its pulp sizing
material (capable of being affected by chromium salts) and also chromium salts,
substantially as and for the purpose set forth.
Dated this 19th day of January 1894
ABEL & IMRAY,
Agents for the Applicant.