Improvements in Dyeing Certain Colours on Cotton Fabrics and Yarns.
Year: 1893

page_text: Date of Application, 19th Apr., 1893
Complete Specification Left, 18th Jan., 1894-Accepted, 24th Feb., 1894
TRUOTIDIONAL DIBUITICATION.
Improvements in Dyeing Certain Colours on Cotton Fabrics
and Yarns.
We, ALEXANDER BEITH HAY, Manufacturing Chemist, and JAMES MOFFATT
PARK, Chemist, both of Maryhill, Glasgow in the County of Lanark, do hereby
declare the nature of this invention to be as follows:-
Our invention relates to dyeing certain fast and permanent colours varying in
shade from grey to olive and olive brown and this we accomplish by fixing on the
fibres, yarns or fabrics, mixtures of oxide of manganese and oxide of chromium,
for grey and olive colours and mixtures of oxide of manganese and oxide of iron
for olive brown colours which mixtures vary in relative proportions according to
the shades of colour required.
In carrying our invention into effect for the production of grey and olive colours,
we take a solution of acetate of manganese at or above 7° Twaddle's hydrometer;
but any other soluble salt of manganese may be employed and mix therewith a
solution of acetate, sulphate or chloride of chromium or any other soluble salt of
oxide of chromium capable of being precipitated by an alkaline chlorate. The
solutions are made of a greater or less degree in strength according to the depth of
colour required.
The fibres, yarns or fabrics are run through the mixed solutions and are then
passed through a solution of caustic soda and chlorate of soda, potash or ammonia
after which they are thoroughly washed and dried.
For the production of olive brown colours we make a solution of acetate of
manganese at or about 7° Twaddle's hydrometer or any other soluble salt of
manganese and mix therewith a solution of acetate, sulphate or chloride of iron
or any other soluble salt of iron, capable of being precipitated by an alkaline
chlorate. The solutions are made of a greater or less degree in strength according
to the depth of colour required.
The yarns or fabrics are run through the mixed solutions and then through a
solution of caustic soda and chlorate of soda, potash or ammonia.
. Should the shades not be of the depth required the operations are repeated and
when very dark shades are wanted, the fibres, yarns or fabrics should be dried
before passing them through the solution of alkaline chlorate.
Dated this Eighteenth day of April 1893.
CRUIKSHANK & FAIRWEATHER,
62, Saint Vincent Street, Glasgow, Agents.
COMPLETE SPECIFICATION.
Improvements in Dyeing Certain Colours on Cotton Fabrics
and Yarns.
We, ALEXANDER BEITH HAY, Manufacturing Chemist and JAMES MOFFATT
PARK, Chemist, both of Maryhill, Glasgow in the County of Lanark, 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:-
Our invention relates to dyeing on cotton fabrics and yarns certain fast and
TD 077

page_text: permanent colours varying in shade from grey to olive and olive brown, and this
we accomplish by fixing on the fabrics and yarns oxides of manganese and chromium
for grey shades and oxides of manganese and iron for olive and brown shades.
In carrying our invention into effect we take for grey shades a solution of any
soluble salt of chromium and mix therewith a solution of any soluble salt of
manganese capable of being precipitated with an alkaline hypochlorite; for olive
and brown shades we take a solution of any soluble salt of manganese and mix
therewith a solution of any soluble salt of iron capable of being precipitated with
an alkaline hypochlorite.
After the fabrics or yarns are bleached in the manner well understood by dyers
the fabrics or yarns are ready for being impregnated with the solutions of chromium
and manganese or manganese and iron.
For grey shade, we take a solution of chrome alum at twelve degrees Twaddle's
hydrometer or an equivalent of any other soluble salt of chromium and mix there-
with acetate of manganese at five degrees of Twaddle's hydrometer or an equivalent
of any other soluble salt of manganese in the proportion of ten gallons of chrome
alum to four gallons of acetate of manganese.
For olive and brown shades we take a solution of acetate of manganese at ten
degrees of Twaddle's hydrometer or an equivalent of any other soluble salts of
manganese and mix therewith acetate of iron at ten degrees of Twaddle's hydro-
meter in the proportion of ten gallons of acetate of manganese to one gallon of
acetate of iron but the proportions may be varied according to the shade required.
The fabrics or yarns after.being impregnated with the metallic solutions are hydro
extracted or squeezed between rollers and are then passed through a solution of
alkaline hypochlorite at two degrees of Twaddle's hydrometer at a temperature of
one hundred and fifty degrees Fahrenheit. We prefer to use hypochlorite
of sodium but any other alkaline hypochlorite will answer the purpose.
After coming out of the hypochlorite bath if the colours are not full enough the
operations are repeated till the desired shades are obtained.
Having now particularly described and ascertained the nature of our said inven-
tion and in what manner the same is to be performed we would have it under-
stood that we do not confine ourselves to the particular proportions or strengths of
materials employed but we declare that what we claim is:-
:-
Dyeing certain fast and permanent colours on cotton fabrics and yarns by fixing
on the said fabrics or yarns, mixtures of oxides of chromium and manganese for
grey shades and oxides of manganese and iron for olive and brown shades substan-
tially in the manner described.
Dated this 17th day of January 1894.
CRUIKSHANK & FAIRWEATHER,
62, St. Vincent Street, Glasgow, Agents.