Year: 1886

page_text: Date of Application, 17th Aug., 1886.
Complete Left, 16th May, 1887.
Complete Accepted, 17th June, 1887.
I THOMAS HOLLIDAY, of the firm of Read Holliday & Sons, of Huddersfield, in the
County of York, Manufacturing Chemist do hereby declare the nature of this invention
to be as follows :-
My invention relates to the dyeing of wool and other textile fibros various shades
of colour by alternately treating the fibres with chrome iron, copper or lead salts to
form mordants and with the nitroso compounds derived from the napthols.
As an example of the method of carrying this invention into effect I boil say
100 lbs. of wool in water with about 3 lbs. of bichromate of soda or bichromate of
potash and 1 lb. sulphuric acid for about 1 hour, then wash off and afterwards pass it
into a hot bath of water containing say 3 lbs. of any of the nitroso compounds
derived from alpha or beta napthol when the colour will be formed and developed in
the fibre. Sulphates of iron or copper and acetate of lead can be substituted for
chromate of potash and the sulphuric acid left out in the above example when iron,
copper or lead mordants are required. The operations given in the example can be
reversed entering the wool first into the nitroso solution and then into the mordant
bath.
The quantities of wool or other fibre and nature of the metallic salt, acid and
nitroso compounds can be varied according to the result required and the shades of
colour varied by using logwood, alizarine or other dyeing or colouring matters along
with or alternatively with the nitroso compounds.
The fibres can be dyed either in a raw, spun, woven, felted or otherwise partly
manufactured or manufactured state.
I prefer to use the nitroso compounds in the state of precipitated paste though they
can be used combined with alkali or otherwise.

page_text: I THOMAS HOLLIDAY of the firm of Read Holliday & Sons of Huddersfield, in the
County of York, Manufacturing Chemist 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 :-
My invention relates to the dyeing of wool and other textile fibres various shades
of color by alternately treating the fibros with chrome iron, copper or lead salts to
form mordants and with the nitroso compounds derived from the napthols.
I have found the Beta Nitroso Alpha napthol and the Alpha Nitroso Beta napthol
to be the compounds best adapted for this process of dyeing.
As an example of the method of carrying this invention into effect I boil say
100 lbs. of wool in water with about 3 lbs. of bichromate of soda or bichromate of
potash and 1 lb. sulphuric acid for about 1 hour, then wash off and afterwards pass
it into a hot bath of water containing say 3 lbs. of a nitroso compound derived from
Alpha or Beta napthol and on boiling the color will be formed and developed in
the fibre.
Sulphates of iron or copper and acetate of lead can be substituted for chromate of
potash and the sulphuric acid left out in the above example when iron, copper or lead
mordants are required.
In practice from 2 to 5 lbs. of Tartar can be used to advantage with the chrome
copper lead or iron salts in the place of the sulphuric acid given in the example.
The operations given in the example can be reversed entering the wool first into the
nitroso solution and then into the mordant bath.
The quantities of wool or other fibre and nature of the metallic salt, acid and nitroso
compounds can be varied according to the result required and the shades of colour
varied by using logwood, alizarine or other dyeing or coloring matters along with
or alternatively with the nitroso compounds.
The fibres can be dyed either in a raw, spun, woven, felted or otherwise partly
manufactured or manufactured state.
When cotton or other fibres which have not the same affinity as wool for metallic
oxides are required to be dyed the oxides of the motals mentioned can be fixed in any
of the ordinary manners well known to dyers.

page_text: I prefer to use the nitroso compounds in the state of precipitated paste though they
can be used combined with alkali or otherwise, if combined with alkali the alkali had
better be neutralized in the dye bath with acetic or other 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 dyeing of textile fibres by forming thereon the products of the combination of
the oxides of chrome iron copper or lead with the nitroso napthols substantially as
described.