Manufacture of a New Black Mordant-dyeing Colouring Matter.
Year: 1896

page_text: PROVISIONAL SPECIFICATION.
Manufacture of a New Black Mordant-dyeing Colouring Matter.
I CHARLES DENTON ABEL, of No. 28 Southampton Buildings, Chancery Lane, in
the County of London, Consulting Engineer and Chartered Patent Agent, do hereby
declare the nature of this invention to be as follows:-
This invention relates to the production of a new mordant-dyeing colouring
matter which is distinguished by the darkness of the shades produced on wool and
by its remarkable fastness to fulling and light.
The constitution of the new dye is represented by the following formula:
This dyestuff is manufactured as follows: 22.1 kilos. of the soda salt of picramic
acid are diazotised in the usual way. The diazo compound is then run into a solution
of 22.3 kilos. of a-naphthylamine-ß,-monosulphonic acid, which solution is made
acid by means of acetic acid. The azo compound thus formed is re-diazotised by
means of hydrochloric acid and a solution of 7 kilos. of sodium nitrite. The diazo
compound which separates as a greenish black precipitate is mixed with a caustic
alkaline solution of 14.4 kilos. of ẞ naphthol.
The colouring matter is formed rapidly and separates as a bluish green precipitate
which is filtered off, pressed and dried.
It forms a dark brown powder of a metallic lustre; its solution in water has a
dark bluish violet colour; soda lye produces a dark greenish blue precipitate, while
acids precipitate the colouring matter in dark bluish violet flakes. The dyestuff
is only sparingly soluble in alcohol with a bluish violet colour; in concentrated
sulphuric acid the solution has a blackish violet shade.
The dyestuff produces on wool, in an acidulated bath, blackish violet tints, which,
by subsequent treatment with chromium salts, are converted into a dark black,
completely fast to washing and light.
In the foregoing example, a,-naphthylamine 8, sulphonic acid may be substi-
tuted for a, naphthylamine-8,-sulphonic acid or a mixture of these two acids may
be used without altering the nature of the colouring matter produced.
Dated this 28th day of September 1896.
ABEL & IMRAY,
Agents for the Applicant.

page_text: Manufacture of a New Black Mordant-dyeing Colouring Matter.
I, CHARLES DENTON ABEL, of No. 28 Southampton Buildings, Chancery Lane, in
the County of London, Consulting Engineer and Chartered Patent Agent, do hereby
declare the nature of this invention (as communicated to me from abroad by The
Actien Gesellschaft für Anilin Fabrikation, of Berlin, in the Empire of Germany,
Chemical Manufacturers,) 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 the production of a new mordant-dyeing colouring
matter which is distinguished. by the darkness of the shades produced on wool and
by its remarkable fastness to fulling and light.
The constitution of the new dye is represented by the following formula:
This dyestuff is manufactured as follows: 22.1 kilos. of the soda salt of picramic
acid are diazotised in the usual way. The diazo compound is then run into a
solution of 22-3 kilos. of a-naphthylamine-ẞ,-monosulphonic acid, which solution
is made acid by means of acetic acid. The azo compound thus formed is re-diazotised
by means of hydrochloric acid and a solution of 7 kilos. of sodium nitrite. The diazo
compound which separates as a greenish black precipitate is mixed with a. caustic
alkaline solution of 14.4 kilos. of ẞ naphthol.
The colouring matter is formed rapidly and separates as a bluish green precipitate
which is filtered off, pressed and dried.
It forms a dark brown powder of a metallic lustre; its solution in water has a
dark bluish violet colour; soda lye produces a dark greenish blue precipitate, while
acids precipitate the colouring matter in dark bluish violet flakes.
The dyestuff is only sparingly soluble with a bluish violet colour; in concentrated
sulphuric acid the solution has a blackish violet shade.
The dyestuff produces on wool, in an acidulated bath, blackish violet tints, which,
by subsequent treatment with chromium salts, are converted into a dark black,
completely fast to washing and light.
In the foregoing example, a,-naphthylamine ẞ, sulphonic acid may be substituted
for a, naphthylamine-6-sulphonic acid or a mixture of these two acids may be
used without altering the nature of the colouring matter produced..
. Having now particularly described and ascertained the nature of this invention
and in what manner the same is to be performed, I declare that what I
claim is :-
1. The herein described manufacture of a black mordant-dyeing colouring matter
by combining one molecule of diazotised picramic acid with one molecule of
Cleve's a-naphthylamine-ß, or B-sulphonic acid or a mixture of these acids,

page_text: rediazotising the product thus obtained and combining it with one molecule
of B-naphthol.
2. The new black mordant-dyeing colouring matter produced as above set forth.
Dated this 8th day of June 1897.
ABEL & IMRAY.
Agents for the Applicant.