Improvements in the Manufacture of Colouring Matters.
Year: 1897

page_text: Date of Application, 3rd Mar., 1897
Complete Specification Left, 3rd Dec., 1897-Accepted, 12th Feb.,
1898
PROVISIONAL SPECIFICATION.
Improvements in the Manufacture of Colouring Matters.
. I, HENRI RAYMOND VIDAL, of 95, Boulevard Beaumarchais, Paris, in the Republic
of France, Chemical Engineer, do hereby declare the nature of this invention to be
as follows:-
I have found that in heating paraphenylene-diamine and hydroquinone in equal
parts in the presence of sulphur, a colouring matter is produced which differs from
those obtained by the reaction upon each of these isolated products of sulphur only
as to para-phenylene diamine and of sulphur and ammonia as regards hydroquinone.
One portion of the product formed is constituted by a colouring matter directly
soluble in the acids without being reduced, and dyeing animal fibres an intense
black.
The other portion dissolves in the alkalies and dyes vegetable fibres a dull blue.
Dated this 2nd dae of Mach 1907
Improvements in the Manufacture of Colouring Matters.
I, HENRI RAYMOND VIDAL, of 95, Boulevard Beaumarchais, Paris, in the Republic
of France, Chemical Engineer, 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: -
I have found that in heating paraphenylene-diamine and hydroquinone in equal
parts in the presence of sulphur, a colouring matter is produced which differs from
those obtained by the reaction upon each of these isolated products of sulphur only
as to para-phenylene-diamine and of sulphur and ammonia as regards hydroquinone.
One portion of the product formed is constituted by a colouring matter directly
soluble in the acids without being reduced, and dyeing animal fibres an intense
black.
The other portion dissolves in the alkalies and dyes vegetable fibres a dull blue.
1st. The proportions of sulphur employed:

page_text: 2nd. Separation of the products.
I separate the products by means of carbonate of soda in aqueous solution or by
an acid. The solution is filtered and neutralised either by an acid, when the
carbonate is employed or by carbonate when acid is employed. I thus isolate a
black colouring matter dyeing in acid solution, animal fibres.
There remains an insoluble product in the carbonate of soda and in the acids
which in the presence of caustic soda or sulphide of sodium dyes vegetable fibres a
dull blue.
•
Having now particularly described and ascertained the nature of my said in-
vention and in what manner the same is to be performed, I declare that what I
claim is:-
1. A method of manufacturing colouring matters, consisting in causing sulphur
in the heated state to act upon a mixture of equal parts of paraphenylenediamine
and hydroquinone.
2. A colouring matter dyeing animal fibres intensely black, and obtained by
dissolving in acids the product resulting from the reaction of the heated sulphur
upon a mixture of equal parts of paraphenylenediamine and hydroquinone.
3. A colouring matter imparting to vegetable fibres a dull-blue tint, and obtained
by dissolving in alkalies the products resulting from the reaction of sulphur in the
heated state upon a mixture of equal parts of paraphenylenediamine and hydro-
quinone.
Dated this 2nd day of D ombow 1007
HASELTINE, LAKE & Co.,
45, Southampton Buildings, London, W.C., Agents for the Applicant.