IMPROVEMENTS IN OBTAINING COLORING MATTERS FOR USE IN COLORING COTTON AND OTHER TEXTILE FIBRES."
Year: 1881

page_text: LETTERS PATENT to Thomas Holliday, of the Firm of Read, Holliday, and
Sons, of Huddersfield, in the County of York, Manufacturing Chemists, for
an Invention of "IMPROVEMENTS IN OBTAINING COLORING MATTERS FOR
USE IN COLORING COTTON AND OTHER TEXTILE FIBRES."
PROVISIONAL SPECIFICATION left by the said Thomas Holliday at the Office
of the Commissioners of Patents on the 14th April 1881.
THOMAS HOLLIDAY, of the Firm of Read, Holliday, and Sons, of Huddersfield, in
the County of York, Manufacturing Chemists. "IMPROVEMENTS IN OBTAINING
5 COLORING MATTERS FOR USE IN COLORING COTTON AND OTHER TEXTILE
FIBRES."
The improvements relate to the employment of the coal tar color, known in
commerce as saffranine, and which color I treat with nitrous acid, and combine the
product with alpha or beta napthol or mixtures thereof, and which combination
may be made in the presence of the fibre.

page_text: SPECIFICATION in pursuance of the conditions of the Letters Patent filed
by the said Thomas Holliday in the Great Seal Patent Office on the
13th October 1881.
THOMAS HOLLIDAY, of the Firm of Read, Holliday, and Sons, of Huddersfield, in
the County of York, Manufacturing Chemists. "IMPROVEMENTS IN OBTAINING
COLORING MATTERS FOR USE IN COLORING COTTON AND OTHER TEXTILE
FIBRES."
The improvements relate to the employment of the coal tar color, known in
commerce as saffranine, and which color I treat with nitrous acid, and combine the
product with alpha or beta napthol or mixtures thereof, and which combination
may be made in the presence of the fibre.
As an example for carrying out these improvements I prepare first a solution of,
say, 2 parts of napthol, 1 part of caustic soda, and 100 parts of water.
Secondly. A solution composed of 1 part of saffranine in 1000 parts of water,.
with 2 parts of muriatic acid, 22 degrees Beaume; to this latter solution add 10 parts
of nitrite of soda solution, 30 degrees Beaume.
I do not however confine myself to this means of azotizing, as other methods may
be adopted.
By mixing these respective solutions the coloring matter will be precipitated.
I prefer in mixing these solutions to add the second to the first, but this may be
varied.
The combination of the solutions in the presence of the fibre may be effected by
first impregnating the fibre with the first mentioned solution, and then with the
second solution, and finally with an alkali, so as to fully develope the color.
The order of the impregnations, as well as the strengths of the solutions, may be
varied, care being taken that the azotized saffranine, the napthol, and the fibre are
simultaneously present when an alkali operates to develope the color.
Having thus described my Invention, I would have it understood that what
I claim as my Invention is, the obtaining coloring matters for. use in coloring cotton
and other textile fibres by the employment of the coal tar color, known as
saffranine, in manner substantially as described.
In witness whereof, I, the said Thomas Holliday, have hereunto set my hand
and seal, this Twelfth day of October, One thousand eight hundred and
eighty one.
THOS. HOLLIDAY. (L.S.)