Improvements in Producing White and Colored Patterns on Cotton Fabrics in Combination with Azo Dyes.
Year: 1895

page_text: Date of Application, 4th Jan., 1895
Complete Specification Left, 3rd Oct., 1895-Accepted, 9th Nov., 1895
PROVISIONAL SPECIFICATION.
Improvements in Producing White and Colored Patterns on Cotton
Fabrics in Combination with Azo Dyes.
We, JOHN ROBB, of Busby Print Works, Busby, in the County of Lanark,
North Britain, Calico Printer, and JAMES GRIME, of the same place, Manager,
do hereby declare the nature of this invention to be as follows, that is to say:
This invention relates to cotton fabrics colored by azo dyes produced by the
application of beta-naphthol or alpha-naphthol followed by the passing of the
fabric through a diazotised solution of aniline, paratoluidine, alpha-naphthal-
amine, nitraniline, or other color-yielding alkaloid; and it has for its object to
produce white and colored patterns on such fabrics in an improved manner.
In carrying out the invention we first print on the fabric one or more of the
"resist" compositions hereinafter described; and afterwards produce the azo dyes
on the fabric in the usual way.
For a white pattern we take tartaric or citric acid, British-gum, water, or other
thickening, glue, and paraffin or other suitable wax. We boit these ingredients
together, and print on the composition in a heated state, using a steam-jacketed
color box.
For a yellow pattern we use the composition described for a white pattern but
with nitrate of lead or other suitable lead salt added.
For a blue pattern Prussian-blue is added to the composition for white.
For a green pattern a mixture of the coin positions for yellow and blue is
employed.
For a pattern in a lighter shade of the ground color or azo dye we print on a
mixture of gum water and oxalate of tin, or other suitable known composition
for diminishing the intensity of the azo dye.
When a lead salt has been used it is converted into a chromate in the usual
way by subsequently passing the fabric through chromatė or bichromate of
potassium.
Dated this Third day of January 1895.
EDMUND HUNT,.
Applicants' Agent..
Improvements in Producing White and Colored Patterns on Cotton
Fabrics in Combination with Azo Dyes.
We, JOHN ROBB, of Busby Print Works, Busby, in the County of Lanark,
North Britain, Calico Printer, and JAMES GRIME, of the same place, Manager,
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, that is to say :-
This invention relates to cotton fabrics colored by azo dyes produced by the
application of beta-naphthol or alpha-naphthol followed by the passing of the fabric

page_text: through a diazotised solution of aniline, paratoluidine, alpba-naphthalamine,
nitraniline, or other color-yielding alkaloid; and it has for its object to produce
white and colored patterns on such fabrics in an improved manner.
In carrying out the invention we first print on the fabric one or more of the
"resist compositions hereinafter described; and afterwards produce the azo dyes
on the fabric in the usual way.
For a white pattern we prepare the resist composition in the following manner.
We take gallons water, 1 pound glue, 1 pound paraffin or other suitable wax, and
4 pounds British-gum or other suitable thickening. We boil the mixture, and add
4 pounds tartaric acid, or citric acid, or other similar acid or mixture; we dissolve
the acid and make up the mixture to 1 gallon.
For a yellow pattern we use the composition described for a white pattern, with
the addition of 4 pounds nitrate of lead, and with the quantity of tartaric or similar
acid diminished to 2 pounds.
For a blue pattern Prussian blue is added to the composition for white in a
proportion suitable for the depth of color desired.
For a green pattern a mixture of the compositions for yellow and blue is
employed.
For a pattern in a lighter shade of the ground color or azo dye we print on a
"semi-resist": for example, a mixture of gum water and oxalate of tin, or any
other suitable known composition for diminishing the development or intensity of
the azo dye. One composition which we may use as a semi-resist is made with
1 pound glue, 3 pounds British gum,pound paraffin or similar wax, and 1 gallon
water, the ingredients being well boiled together. With this composition we may
sometimes combine another coloring matter such for example as what is known as
"erica."
The resist compositions which have been described must be hot when being
printed on the fabric, steam-jacketed color boxes being employed to maintain the
heat.
The fabric is passed through the printing machine and dried in the usual
manner; and it is then taken and prepared in an ordinary slop-padding mangle
with naphtholate of soda, the color being subsequently developed with a diazotised
alkaloid in the usual manner.
When a lead salt has been used, the fabric, after developing, is passed through a
solution of a chromate or bichromate to convert the lead into chromate.
Having now particularly described and ascertained the nature of our said inven-
tion and in what manner the same is to be performed, we declare that what we
claim is :-
1. The producing of white and colored patterns on cotton fabrics in com-
bination with azo dyes by printing special resist compositions on the fabrics prior
to the formation of the azo dyes thereon substantially as hereinbefore described.
2. The using of paraffin or similar wax as an ingredient of a "resist " composition
and the printing or applying of the same in a heated state substantially as and for
the purposes hereinbefore described.
Dated this Second day of October 1895.
EDMUND HUNT,
Applicants' Ageut.