Improvements in the Manufacture of Colouring Matters.
Year: 1898

page_text: Date of Application, 10th Mar.,
1898
1000
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:-
In the Specification of my former Application of March 16th, 1897, No. 6913, I
have described a black colouring matter, obtained by heating, in the presence of
sulphur, the blue coloring matter formed by condensing parasulphanilic acid with
paramidophenol.
This blue coloring matter forms the subject of another former Application for
a Patent of March 13th 1897, No. 6694.
In the specification of an application of even date herewith I have described a
blue-black coloring matter produced by the prolonged melting, at a high tempera-
ture, of parasulphanilic with paramidophenol.
This blue-black coloring matter, treated by sulphur and caustic soda, is converted
into a black coloring matter which resists soap and the action of light better than
the preceding one.
In carrying out the process forming the subject of the present application I heat
in an oil bath 28 kilogrammes of black coloring matter derived from parasulphanilic
acid and paramidophenol, 25 kilogrammes of a solution of caustic soda at 33%
until the dissolution and thickening of the mass. I add to this mass at a tempera-
ture of 170°, 6 kilogrammes of sulphur and maintain this temperature until the
mass has become hard. It is then taken out of the apparatus, cooled and ground.
The coloring matter thus obtained appears in the form of a black brittle mass,
soluble into black in water as well as in alkaline carbonates, caustic alkalies and
alkaline sulphurets. It is insoluble in acids, its caustic solutions oxidizing in the
air, precipitation taking place at the same time; finally it dyes vegetable fibres
black in baths of alkaline sulphuret and sea salt, and becomes more intense by
being placed in a bath of bichromate and of acid.
1 1000
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

page_text: in what manner the same is to be performed, to be particularly described and
ascertained in and by the following statement:-
In the Specification of my former Application of March 16th 1897, No. 6913, I
have described a black colouring matter, obtained by heating, in the presence of
sulphur, the blue colouring matter formed by condensing parasulphanilic acid with
paramidophenol.
This blue colouring matter formed the subject of another former Application for
a Patent of March 18th 1897, No. 6694.
In the Specification of an Application of even date herewith No. 5915 I have
described a blue-black colouring matter produced by the prolonged melting, at a
high temperature, of parasulphanilic acid with paramidophenol.
This blue black colouring matter, treated by sulphur and caustic soda, is con-
verted into a black colouring matter, which resists soap and the action of light
better than the preceding one.
In carrying out the process forming the subject of the present application I heat
in an oil bath 28 kilogrammes of blue black colouring matter derived from
parasulphanilic acid and paramidophenol, 25 kilogrammes of a solution of caustic
soda at 33% until the dissolution and thickening of the mass. I add to this mass
at a temperature of 170° 6 kilogrammes of sulphur, and maintain this temperature
until the mass has become hard. It is then taken out of the apparatus, cooled and
ground to a powder.
The colouring matter thus obtained appears in the form of a black, brittle mass,
soluble into black in water as well as in alkaline carbonates, caustic alkalies and
alkaline sulphurets. It is insoluble in acids, its caustic solutions oxidizing in the
air precipitation taking place at the same time; finally it dyes vegetable fibres
black without corroding them in baths of alkaline sulphuret and sea salt, and
becomes more intense by being placed in a bath of bichromate and of acid.
Having now particularly described and ascertained the nature of my said
invention and in what manner the same is to be performed, I declare that what
I claim is:
The action of sulphur and of soda on the blue black colouring matter obtained by
the prolonged melting, at a high temperature of parasulphanilic acid with
paramidophenol according to former Application No. 5915 for the purpose of
obtaining a black colouring, dyeing vegetable fibres without corroding them.
Dated this 17th day of November 1898
FANTA
HASELTINE, LAKE & Co.,
45, Southampton Buildings, London, W.C.,
Agents for the Applicant.