Manufacture of a Novel Coloring Matter.
Year: 1893

page_text: Date of Application, 18th Sept., 1893
Complete Specification Left, 18th June, 1894-Accepted, 21st July, 1894
PROVISIONAL SPECIFICATION.
[Communicated from abroad by THE FARBWERKE vormals MEISTER LUCIUS
AND BRUNING, of Hoechst a/ Main, in the Empire of Germany, Chemical
Manufacturers.]
Manufacture of a Novel Coloring Matter.
I, OLIVER IMRAY of No. 28 Southampton Buildings, Chancery Lane, in the
County of London, Chartered Patent Agent, do hereby declare the nature of this
invention to be as follows:-
My foreign correspondents have discovered that by reducing dinitro-
anthrachrysone-disulphonic acid there can be produced valuable coloring matters
which dye wool in various shades. The coloring matter obtained by reduction in
acid solution dyes wool in acid bath a pure violet and chromed wool in blue
shades.
Further, they have discovered that this coloring matter by boiling with alkalies
can be converted into a novel coloring matter of great value and dyeing on
mordants.
The manner of carrying out the invention is described more fully in the following
example:
The coloring matter obtained by reduction of the dinitro-anthrachrysone-
disulphonic acid in acid solution is introduced into a somewhat largely diluted
solution of carbonate of soda, in which it dissolves with red-blue color.
If the solution be boiled for some time, say 2 hours, the greater part of the
novel coloring matter separates in the form of a red crystalline powder. In order
to effect a complete separation, the alkali is neutralized with a small excess of acid
and is precipitated while hot by means of common salt.
The novel coloring matter is in the form of a red crystalline powder, dissolving
in hot water with a beautiful red color, and in diluted alkalies, with a blue color.
An excess of alkali precipitates the alkali-salt of the sulphonic acid, which
dissolves with difficulty.
The solution of the coloring matter in concentrated sulphuric acid is colored
bluish-red and shows fluorescence.
The free sulphonic acid is only slightly soluble in hot alcohol and acetone,
showing red color. In the other usual organic solvents it is practically insoluble.
The coloring matter dyes as well on mordants as in acid bath. Wool in acid
bath is dyed a beautiful red, and chromed wool deep pure blue shades. The tints
produced in acid bath can subsequently be shaded at will by means of metallic
mordants.
The tints developed by mordants are absolutely fast to light and fulling and
excel by extraordinary purity of shade.
Dated this 18th day of September 1893.
ABEL & IMRAY,
Agents for the Applicant.

page_text: COMPLETE SPECIFICATION.
Manufacture of a Novel Coloring Matter.
I, OLIVER IMRAY, of No. 28 Southampton Buildings, Chancery Lane, in the
County of London, Chartered Patent Agent, 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:-
My foreign correspondents have discovered that by reducing dinitro-
anthrachrysone-disulphonic acid there can be produced valuable coloring matters
which dye wool in various shades. The coloring matter obtained by reduction in
acid solution dyes wool in acid bath a pure violet and chromed wool in blue
shades.
Further, they have discovered that this coloring matter by boiling with alkalies
can be converted into a novel coloring matter of great value, and dyeing on
mordants.
The manner of carrying out the invention is described more fully in the following
example:
The colouring matter obtained by reduction of the dinitro anthrachrysone
disulphonic acid in acid solution is introduced into a somewhat largely diluted
solution of carbonate of soda, in which it dissolves with red blue color.
If the solution be boiled for some time, say 2 hours, the greater part of the
novel coloring matter separates in the form of a red crystalline powder.
In order to effect a complete separation, the alkali is neutralized with a small
excess of acid and the colouring matter is precipitated while hot by means of
common salt.
Instead of heating the reduction product with carbonate of soda, it may be
heated with other alkaline carbonate, or with alkali or alkaline carth in order to
produce the novel coloring matter.
This new coloring matter is in the form of a red crystalline powder, dissolving in
hot water with a beautiful red color, and in diluted alkalies, with a blue color. An
excess of alkali precipitates the alkali-salt of the sulphonic acid, which dissolves
with difficulty.
The solution of the coloring matter in concentrated sulphuric acid is colored
bluish red and shows fluorescence.
The free sulphonic acid is only slightly soluble in hot alcohol and acetone,
showing red color. In the other usual organic solvents it is practically insoluble.
The coloring matter dyes as well on mordants as in acid bath. Wool in acid
bath is dyed a beautiful red, and chromed wool deep pure blue shades. The tints
produced in acid bath can subsequently be shaded at will by means of metallic
morlants.
The tiuts developed by mordants are absolutely fast to light and fulling, and
excel by extraordinary purity of shade.
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 :-
1. The manufacture of a novel coloring matter by heating with alkali, alkaline
carbonate or alkaline earth, the products obtained by reducing dinitro-
anthrachrysone-disulphonic acid with the usual reducing agents, substantially as
described.
2. The novel coloring matter manufactured as above set forth.
Dated this 18th day at Luns 1001
ABEL & IMRAY,
Agents for the Applicant.