Process of Preparing Solutions of Artificial and Natural Colouring Matters for Dyeing and Printing Purposes.
Year: 1896

page_text: Date of Application, 24th Sept., 1896
Complete Specification Left, 28th May, 1897-Accepted, 3rd July, 1897
PROVISIONAL SPECIFICATION.
Process of Preparing Solutions of Artificial and Natural Colouring
Matters for Dyeing and Printing Purposes.
I, WILLIAM CLARK of the Firm of A. M. & Wm Clark of 53, Chancery Lane in
the County of Middlesex, Fellow of the Chartered Institute of Patent Agents; do
hereby declare the nature of this Invention (a communication to me by the Firm of
C. H. Boehringer Sohn of Niederingelheim-on-the-Rhine, Germany, Manufacturers ;)
to be as follows:--
Lactic acid and certain of its derivatives, and more particularly its acetyl derivatives
and esters, easily dissolve a great many artificial and natural colouring inatters which
are difficultly soluble, or even insoluble, in the ordinary solvents.
The solutions so obtained can in many cases be directly utilized for dyeing and
printing by the usual methods.
The solutions may be prepared in a concentrated form for sale or be prepared in
each case before use.
The following are examples of the use of solutions of colouring matters prepared'
according to this Invention:-
I. SOLUTION OF ARTIFICIAL COLOURING MATTER IN LACTIC ACID.
(1) Preparation of the Solution.
20 kilos of Induline B soluble in spirit are dissolved at a moderate
heat in 50 kilos of lactic acid at 73°.
(2) Printing on bleached calico.
The calico is printed with the following printing paste:
25 grammes tannic acid.
50 grammes acetic acid.
700 grammes thickening of starch and tragacanth.
75 grammes colouring solution above mentioned.
150 grammes water.
dried, steamed for half an hour at atmospheric pressure, fixed in a lukewarm bath
containing 5 grammes tartar emetic and 5 grammes ground chalk per litre of water,
and washed.
(3) Printing on woollen cloth.
The following printing paste is employed for printing on wool prepared with chloride
of lime :-
600
grammes gum water.
25 grammes sulphuric acid.
75 grammes solution of Induline.
300 grammes water.
dried, steamed for one hour without pressure, and washed.
(4) Dying on silk yarn.
The boiled off silk is entered at 80 degrees F. and worked by hand for about half
an hour in a bath containing :-
20 kilos water.
50 kilos boiled off liquor well broken with
10 kilos acetic acid at 6 degrees Baumé.
95 kilos enlution of Induline

page_text: the temperature of the bath is then raised within an hour to boiling point and boiled
for half an hour longer, then washed and brightened in a fresh bath slightly acidified
with lactic acid.
II. SOLUTION OF NATURAL COLOURING MATTER IN LACTIC ACID.
1 kilo well ground indigo is dissolved by heating moderately in 9 kilos lactic
acid (93°).
III. SOLUTION OF ARTIFICIAL COLOURING MATTERS IN A DERIVATIVE OF LACTIC
ACID, SUCH AS, FOR EXAMPLE, THE ETHYLESTER OF LACTIC ACID.
1 kilo spirit Induline is dissolved by heating moderately in 9 kilos ethylester of
lactic acid.
Dated this 24th day of September 1896
A. M. & WM. CLARK,
Chartered Patent Agents, 53, Chancery Lane, London.
COMPLETE SPECIFICATION.
Process of Preparing Solutions of Artificial and Natur Colouring
Matters for Dyeing and Printing Purposes.
I, WILLIAM CLARK of the Firm of A. M. & Wm. Clark of 53, Chancery Lane in
the County of Middlesex, Fellow of the Chartered Institute of Patent Agents; do
hereby declare the nature of this Invention (a communication to me by the Firm of
C. H. Boehringer Sohn of Niederingelheim-on-the-Rhine, Germany, Manufacturers ;)
and in what manner the same is to be performed to be particularly described and
ascertained in and by the following statement :-
Lactic acid and certain of its derivatives, and more particularly its acetyl derivatives
and esters, easily dissolve a great many artificial and natural colouring matters which
are difficultly soluble, or even insoluble, in the ordinary solvents.
The solutions so obtained can in many cases be directly utilized for dying and
printing by the usual methods.
The solutions may be prepared in a concentrated form for sale or be prepared in
each case before use.
The following are examples of the use of solutions of colouring matters prepared
according to this Invention:-
I. SOLUTION OF ARTIFICIAL COLOURING MATTER IN LACTIC ACID.
(1) Preparation of the solution.
20 kilos of Induline B soluble in spirit are dissolved at a moderate
heat in 50 kilos of lactic acid at 73º.
(2) Printing on bleached calico.
The calico is printed with the following printing paste:
25 grammes tannic acid.
50 grammes acetic acid.
700 grammes thickening of starch and tragacanth.
75 grammes colouring solution above mentioned.
150 grammes water.
dried, steamed for half an hour at atmospheric pressure, fixed in a lukewarm bath
containing 5 grammes tartar emetic and 5 grammes ground chalk per litre of water,
and washed.
(3) Printing on woollen cloth.
The following printing paste is employed for printing on wool prepared with chloride
of lime-
600 grammes gum water.
25 grammes sulphuric acid.
75 grammes solution of Induline.
300 grammes water..
dried, steamed for one hour without pressure, and washed.

page_text: The boiled off silk is entered at 80° F. and worked by hand for about half an hour in
a bath containing :-
20 kilos water.
50 kilos boiled off liquor well broken with
10 kilos acetic acid at 6° Baumé.
25 kilos solution of Induline.
The temperature of the bath is then raised within an hour to boiling point and boiled
for half an hour longer then washed and brightened in a fresh bath slightly acidified
with lactic acid.
II. SOLUTION OF NATURAL COLOURING MATTER IN LACTIC ACID.
1 kilo well ground indigo is dissolved by heating moderately in 9 kilos lactic
acid (93°).
III. SOLUTION OF ARTIFICIAL COLOURING MATTERS IN A DERIVATIVE OF LACTIC
ACID, SUCH AS, FOR EXAMPLE, THE ETHYLESTER OF LACTIC ACID.
1 kilo spirit Induline is dissolved by heating moderately in 9 kilos ethylester of
lactic acid.
Having now particularly described and ascertained the nature of the said Invention
and in what manner the same is to be performed I declare that what I claim is :-
The preparation of solutions of artificial and natural colouring matters for dyeing
and printing purposes, by dissolving said matters in lactic acid or its derivatives such
as its acetyl derivatives and esters.
Dated this 28th day of May 1897.
A. M. & WM. CLARK,
Chartered Patent Agents, 53, Chancery Lane, London.