Improvements in Dyeing Cotton.
Year: 1890

page_text: Date of Application, 11th Sept., 1890
Complete Specification Left, 10th June, 1891-Accepted, 11th Sept., 1891
TROYDONAL DECIDICATION.
Improvements in Dyeing Cotton.
I THOMAS INGHAM of 18 Johnson Street Cheetham Manchester in the County
of Lancaster Chemist do hereby declare the nature of this invention to be as
follows:-
This invention relates chiefly to the dyeing of cotton woven fabrics but it is
also applicable to cotton yarns especially when they are dyed in the open state,
the object of my invention being to produce a good and perinanent black.
The invention consists mainly in the employment of a dye formed by a mixture
of a decoction of logwood, or a mixture of logwood with other dyewood liquors,
such as bark, fustic, shumac, or gallo-flavine, and a small proportion of sulphate
of copper boiled in the presence of a suitable quantity of acetic acid.
When dyeing a woven fabric it is first washed with a suitable detergent and then
rinsed and dried. It is then passed in the open state through a vessel containing
the dye mixed as before described and then dried; the action of the acetic acid
in the above mixture will be to prevent any oxidization of the logwood dye, by
the sulphate of copper until the cloth has been thus dried.
The cloth is then passed through a suitable solution (bichromate of soda or
potash for example) in order to oxidize the same and fix the color, and it will
be found that my improved mixture when used as above described will produce
a black which cannot be obtained by an ordinary plain bath of logwood liquor.
Dated this 10th day of September 1890.
GEO. DAVIES & SON,
4, St. Ann's Square, Manchester, Agents for the Applicant.
COMPLETE SPECIFICATION.
Improvements in Dyeing Cotton.
I THOMAS INGHAM of 18 Johnson Street Cheetham Manchester in the County
of Lancaster 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 :--
This invention relates chiefly to the dyeing of cotton woven fabrics but it is also
applicable to cotton yarns especially when they are dyed in the open state, the
object of my invention being to produce a good and permanent black.
The invention consists mainly in the employment of a dye formed by a decoction
of logwood (or a mixture of logwood with other dyewood liquors such as bark,
fustic, shumac or gallo-flavine) and a mordant consisting of a small proportion of
sulphate or other analogous salt of copper, boiled in the presence of a suitable
quantity of acetic acid.
When dyeing a cotton woven fabric or yarn according to my invention it is first
washed and cleansed with a suitable detergent, after which it is rinsed and dried.
It is then passed, in the open state through a vessel or bath containing the
logwood or other vegetable coloring matter or dye mixed as before described with
a mordant, the most suitable being sulphate of copper in the presence of acetic acid
(but other salts of copper may be used) and thus, dried, the action of the acetic acid
being to prevent any oxidation of the lugwood or other vegetable dye or coloring
matter by the sulphate or salt of copper until the drying has been effected.
The cloth or yarn, after drying is then finally oxidized by passing it through a
D

page_text: bath containing a solution of bichromate of soda, bichromate of potash or other
suitable oxidizing agent to fix the color, and it will be found that my improved
mixture when used as described will produce a black which cannot be obtained by
the use of an ordinary plain bath of logwood liquor or other similar dye wood
liquor.
For example I pass the dried cloth or yarn (previously cleansed) in the open
state through the following bath eist. :
GEO. DAVIES & SON,
4, St. Ann's Square, Manchester, Agents for the Applicant.