Producing Print Patterns in Colors on Cotton Fabrics by the Aid of Safranine-azo Dyestuffs.
Year: 1895

page_text: Date of Application, 16th Oct., 1895
Complete Specification Left, 14th July, 1896-Accepted, 15th Aug., 1896
PROVISIONAL SPECIFICATION.
Producing Print Patterns in Colors on Cotton Fabrics by the Aid of
Safranine-azo Dyestuffs.
I, RICHARD MICHEL, of 6 Sandwirthgasse, Vienna, Austria, do hereby declare
the nature of this invention to be as follows:-
Certain reducing agents decompose the blue azo dyestuffs obtained by the com-
bination of diazosafranines with naphtols, amido-naphtols or dioxynaphtalines and
also the tannin compounds of these dye-stuffs forming safranines and the colorless
amidoderivatives of the other components. I have found that this property can
be made use of for producing in a very simple manner blue prints with red
patterns a very important product in the printing industry.
For example the dyestuff produced in acetic solution from diazosafranine and
beta-naphtol known under the commercial denomination of naphtindone is dyed as
usual on to cotton cloth mordanted with tannin and tartar emetic and then a
discharge is printed thereon composed say as follows:
2 litres acetate of tin 42° Tw.
200 grammes wheat starch.
150
white dextrine.
"
After printing the goods are steamed and washed.
Thus on a dark blue ground a biuish red design is obtained the shade of which
may be altered at will by adding to the discharge non-reducible dyestuffs such as
for instance thioflavine T or cosine and the like.
Instead of dyeing the cloth with safranineazo dyestuff, the latter may be printed
on the cloth in which case it is advantageous to print on the discharge previously
as a so-called resist. As some of the safranine-azo derivatives possess a pronounced
affinity to the cotton fibre, the use of tannin for fixation is not absolutely necessary.
The method of dyeing permitting, other dyestuffs which can be easily discharged
white, as for instance certain diamine colors, can be dyed together with the
safranine-azo-dyestuffs.
Dated this 16th day of October 1895.
Producing Print Patterns in Colors on Cotton Fabrics by the Aid of
Safranine-azo Dyestuffs.
I, RICHARD MICHEL, of 6 Sandwirthgasse, Vienna, Austria, 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 :—
Certain reducing agents decompose the blue azo dyestuffs obtained by the com-
bination of diazo-safranines with Daphtols, amido-naphtols or dioxynaphtalines and

page_text: also the tannin compounds of these dyestuffa forming safranines and the colorless
amido derivatives of the other components. I have found that this property can
be made use of for producing in a very simple manner blue prints with red
patterns a very important product in the printing industry.
For example the dyestuff produced in acetic solution from diazo safranine and
beta-naphtol known under the commercial denomination of naphtindone is dyed as
usual on to cotton cloth mordanted with tannin and tartar emetic and then a
discharge is printed thercon composed say as follows :—
2 litres acetate of tin 42° Tw.
200 grammes wheat starch.
150
white dextrine.
After printing the goods are steamed and washed.
Thus on a dark blue ground a bluish red design is obtained the shade of which
may be altered at will by adding to the discharge non-reducible dyestuff's such as
for instance thioflavine I or cosine and the like.
Instead of dyeing the cloth with the safraniue-azo dyestuff, the latter may be
printed on the cloth in which case it is advantageous to print on the discharge
previously as a so-called resist. As some of the safranine-azo derivatives possess a
pronounced affinity to the cotton fibre, the use of tannin for fixation is not absolutely
necessary. The method of dyeing permitting, other dyestuffs which can be easily
discharged white, as for instance certain diamine colours, can be dyed together with
the safranine-azo-lyestuffs.
Having now particularly described and ascertained the nature of my said inven
tion and in what manner the same is to be performed, 1 declare that what I
claim is :-
Producing print patterns in colors (blue-red combination) by first dyeing or
printing safranine-azo derivatives on a cotton fabric with or without the help of a
mordant and printing afterwards with a reducible discharge or rice versa substantially
as described.
Dated this 4th day of July 189R
RICHID. MICHEL.