IMPROVEMENTS IN DYEING ANIMAL AND VEGETABLE FIBRES BLACK
Year: 1879

page_text: LETTERS PATENT to Thomas Holliday, Manufacturing Chemist, of the Firm
of Read, Holliday, and Sons, of Huddersfield, in the County of York, for the
Invention of "IMPROVEMENTS IN DYEING ANIMAL AND VEGETABLE FIBRES
BLACK"
PROVISIONAL SPECIFICATION left by the said Thomas Holliday at the Office
of the Commissioners of Patents on the 19th April 1879.
THOMAS HOLLIDAY, Manufacturing Chemist, of the Firm of Read, Holliday, and
Sons, of Huddersfield, in the County of York. "IMPROVEMENTS IN DYEING ANIMAL
AND VEGETABLE FIBRES BLACK."
The object of my Invention is to enable animal and vegetable fibre (as wool and
cotton), when such fibre is mixed together in the raw state, or as yarn or thread, or
when woven, to be together more advantageously dyed black.
For this purpose, when mordanting for a logwood dye or logwood in combination
with other inatters, as is well understood, according to the effect desired to be pro-
duced, I employ a mordant that is not injuriously acted upon by aniline black dye.
For this purpose the chrome and argol mordant answers well.
The mixed fibre is then subjected to the action of the aniline black dye, and is
washed if desired to free it of any excess of acid therein.
The fibre is then subjected to logwood dye alone or in combination with other
matters, as is well understood, according to the particular effect desired to be
produced.
I do not however confine myself to the precise process described so long as the
fibres are when together subjected to the action of aniline black dye and the
coloring matter of logwood.

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 15th October
1879.
THOMAS HOLLIDAY, Manufacturing Chemist, of the Firm of Read, Holliday, and
Sons, of Huddersfield, in the County of York, "IMPROVEMENTS IN DYEING ANIMAL
AND VEGETABLE FIBRES BLACK."
The object of my Invention is to enable animal and vegetable fibres (as wool and
cotton), when such fibres are mixed together either in the raw state, or as yarn or
thread, or when woven, to be together more advantageously dyed black.
For this purpose, when mordanting for a logwood dye or logwood in combination
with other matters, as is well understood, according to the effect desired to be pro-
duced, I employ a mordant suitable for the action of logwood dye on wool, and one
that is not injuriously acted upon by aniline black dye.
For this purpose the chrome and argol mordant answers well.
The mixed fibre is then subjected to the action of the aniline black dye to dye
the cotton portion of it, and it is washed if desired to free it of any excess of acid
therein, or any remaining acid is neutralized.
The fibre is then subjected to logwood dye alone or in combination with other
matters, as is well understood, according to the particular effect desired to be
produced.
Thus it will be found that the wool portion of the mixed fibre will be dyed by
the logwood dye, and the cotton portion thereof by the aniline dye.
I do not however confine myself to the precise process described so long as the
fibres are when together subjected to the action of aniline black dye and the coloring
matter of logwood.
Having thus described my Invention and means which I adopt in carrying the
same into effect, I would have it understood that what I claim is, the improve-
ments in dyeing mixed animal and vegetable fibres black, substantially as herein
described.
In witness whereof, I, the said Thomas Holliday, have hereunto set my hand
and scal, this Fourteenth day of October, in the year of our Lord One
thousand eight hundred and seventy nine.
THOMAS HOLLIDAY.
(L.S.)