Production of Fast Brown to Brown-black Tints on the Fibre by Combining Naphthol with the Diazo Compound of Diamido- carbazol.
Year: 1897

page_text: Production of Fast Brown to Brown-black Tints on the Fibre
by Combining Naphthol with the Diazo Compound of Diamido-
carbazol.
I, OLIVER IMRAY, of Birkbeck Bank Chambers, Southampton Buildings, Chancery
Lane, in the County of London, Chartered Patent Agent, do hereby declare the
nature of this invention (as communicated to me from abroad by The Farbwerke
vormals Meister Lucius and Brüning, of Hoechst a/ Main, in the Empire of
Germany, Chemical Manufacturers,) to be as follows:-
In cotton printing and dyeing diazo compounds of benzidin and tolidine combined
with B-naphthol are much used for producing brown colours on the fibre.
The colours thus obtained are of a beautiful reddish-brown tint and fast to soap.
Their fastness to light, however, is defective and cannot even be improved by treating
the dyestuffs produced on the fibre with copper salts.
My foreign correspondents have succeeded in producing with B-naphthol a brown
very fast to light, by combining the ẞ-naphthol with the diazo compound of the
diamidocarbazol.
The diazo compounds are either used in a pure state, whereby a brown to brown-
black relatively fast to light is obtained, or an appropriate copper salt is added thus
increasing the fastness to light of the dyestuffs produced.
Of the brown dyestuffs, fast to light, the one obtained with the meta-compound
has moreover the advantage over the benzidine or tolidine dyestuffs, that it has a
yellowish tint which is mostly preferred to the reddish one. The p-compound
yields a very powerful valuable brown-black.
The manufacture of the brown from diamidocarbazol is carried out in the usual
manner:-

page_text: Printing colour I
Printing colour II
500 grammes of tragacanth water 60: 1000
500 cubic centimetres of diazosolution
50 grammes of crystallized acetate of sodium
400 grammes of tragacanth water 60: 1000
500 cubic centimetres of diazo solution
100 cubic centimetres of copper solution
50 grammes of crystallized sodium acetate
ABEL & IMRAY,
Agents for the Applicant.
Production of Fast Brown to Brown-black Tints on the Fibre
by Combining Naphthol with the Diazo Compound of Diamido-
carbazol.
I, OLIVER IMRAY, of Birkbeck Bank Chambers, Southampton Buildings, Chancery
Lane, in the County of London, Chartered Patent Agent, do hereby declare the nature
of this invention (as communicated to me from abroad by The Farbwerke vormals
Meister Lucius and Brüning of Hoechst a/ Main, 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:-
In cotton printing and dyeing diazo-compounds of benzidine and tolidine combined
with B-naphthol are much used for producing brown colours on the fibre.
The colours thus obtained are of a beautiful reddish-brown tint and fast to soap.
Their fastness to light, however, is defective and cannot even be improved by treating
the dyestuffs produced on the fibre with copper salts.

page_text: My foreign correspondents have succeeded in producing with ẞ-naphthol a brown
very fast to light, by combining the B-naphthol with the diazo-compound of the
diamidocarbazol.
to
The diazo-compounds are either used in a pure state, whereby a brown
brown-black relatively fast to light is obtained, or an appropriate copper salt is
added thus increasing the fastness to light of the dyestuffs produced.
Of the brown dyestuffs, fast to light, the one obtained with the meta-compound
has moreover the advantage over the benzidine or tolidine dyestuffs, that it has a
yellowish tint which is mostly preferred to the reddish one. The p-compound yields
a very powerful valuable brown-black.
The manufacture of the brown from diamidocarbazol is carried out in the usual

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
1. The production of brown to brown-black tints on the fibre by printing or
padding a thickened diazo-solution of a diamidocarbazol, with or without a copper
salt, on naphthol grounded fabric, or by passing naphthol grounded fabric through
the diazo-solution of a diamidocarbazol with or without admixture of a copper salt,
substantially as described.
2. Fabrics dyed brown to brown-black in the manner above set forth.
ABEL & IMRAY,
Agents for the Applicant.