A New Manufacture of Red Coloring Matter.
Year: 1892

page_text: Date of Application, 3rd Nov., 1892
Complete Specification Left, 2nd Aug., 1893-Accepted, 16th Sept., 1893
PROVISIONAL SPECIFICATION.
[Communicated from abroad by THE FARBWERKE vormals MEISTER LUCIUS &
BRUNING, of Hoechst a Main, in the Empire of Germany, Chemical
Manufacturers.]
A New Manufacture of Red Coloring Matter.
I, OLIVER IMRAY of No. 28. Southampton Buildings in the County of
London, Chartered Patent Agent, do hereby declare the nature of this invention
to be as follows:-
Experiments made by my foreign correspondents for the purpose of producing
nitrated rhodamines by nitrating rhodamine have not given satisfactory results,
but they have succeeded in producing a nitro-derivative of rhodamine in another
way. They discovered that under certain conditions di-nitro-chloro-benzene
combines with rhodamine or rhodamine-base, forming a new body, which
coloring matter possesses valuable qualities; for shortness sake this body will
hereinafter be called "nitro-rosamine."
as
In order to produce this nitro-rosamine, rhodamine (the hydrochlorate of tetra-
ethyl- or tetramethyl-amido-phenol-phthaleine) or the coloring matter-base (tetra-
ethyl- or tetramethyl-amido phenol-phthaleine) are submitted to the action of meta
dinitro-chloro-benzene, heating the two bodies in alcoholic solution-with or
without addition of alkali-at the boiling temperature of alcohol, for from 10 to
12 hours.
The nitrorosamine is in the form of a red powder, of difficult solubility in
boiling water, but easily soluble in alcohol and in acetic acid of 50 per cent., and it
possesses an essentially greater affinity for vegetable fibre than rhodamine, from
which also it differs essentially in shade, nitrorosamine dyeing wool a more
pronounced yellowish shade, and tanned cotton a somewhat more blueish shade
than rhodamine.
ABEL & IMRAY,
Agents for the Applicant.
COMPLETE SPECIFICATION.
A New Manufacture of Red Coloring Matter.
I, OLIVER IMRAY, of No. 28 Southampton Buildings, 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 :-
Experiments made by my foreign correspondents for the purpose of producing
nitrated rhodamines by nitrating rhodamine have not given satisfactory results,
but they have succeeded in producing a nitro-derivative of rhodamine in another
Price 8d.1

page_text: way. They discovered that under certain conditions dinitro-chloro-benzene
combines with rhodamine or rhodamine base, forming a new body, which, as
colouring matter, possesses valuable qualities; for the sake of brevity this body
will hereinafter be called "nitro-rosamine."
In order to produce this nitro-rosamine, rhodamine (the hydrochlorate of tetra-
ethyl- or tetra-methyl-meta-amido phenol-phthaleine) is submitted to the action of
meta-dinitro-chloro-benzene the two bodies being heated in alcoholic solution with
addition of alkali, at the boiling temperature of alcohol. Or the colouring matter
base (tetra-ethyl- or tetra-methyl-meta-amido phenol-phthaleine) is treated in the
same way without the addition of alkali.
The nitro-rosamine is in the form of a red powder, of difficult solubility in
boiling water, but easily soluble in alcohol and in acetic acid of 50 per cent., and it
possesses an essentially greater affinity for vegetable fibre than rhodamine, from
which also it differs essentially in shade, nitro-rosamine dyeing wool a more
pronounced yellowish shade and tanned cotton a somewhat more blueish shade than
rhodamine
ABEL & IMRAY,
Agents for the Applicant.