Year: 1887

page_text: Date of Application, 3rd Mar., 1887.
Complete Left, 3rd Dec., 1887
Complete Accepted, 2nd Mar., 1888
Printing.
We, ROBERT CHADWICK and JOHN WILLIAM CONSTERDINE-CHADWICK, trading as
Robert Chadwick & Son of Clensmore Chemical Works, Kidderminster, County of
Worcester, Manufacturers, do hereby declare the nature of this invention to be as
follows:-
Our invention relates to the preparation of a coloring matter suitable for use in
dyeing, staining, painting or printing in black, blue, and other colors, that can be
used either as a pigment or carmine, powder, or fluid capable of being used by dyers,
painters, printers, stainers and bleachers and that will enable a fabric or other
material to be dyed in a single bath in from 20 to 40 minutes, instead of taking over
two hours as with dyes at present used or by the two bath process.
For this purpose we mix with about 12 quarts of water, about 12 ounces of "Atlas
Violet," 4 ounces of "3 R Aniline Scarlet," 2 lbs. of Nigrosine, 1 lb. of Irish Moss,
6 lbs. of Indigo Extract and 1 lb. of D. O. Vitriol. These ingredients, when incor-
porated, will produce about 34 lbs. of dye ready for use. They are mixed together at
boiling point, and the compound is then first strained through a sieve and then
filtered through cloth.
The said coloring matter will dye blue, black and other colors in various shades
according to the amount of pigment used, with the addition of more or less sulphuric
acid and of small quantities of other coloring matters in the bath which will modify
he action of the compound.
Although we prefer to employ the whole of the ingredients in combination as set
orth and in about the proportions given, yet we do not limit ourselves to that precise
combination or proportion, as these may be varied according to the purposes to which
he coloring matter is to be applied.
D
1
1
ABEL & IMRAY,
Agents for the Applicants.

page_text: We, ROBERT CHADWICK and JOHN WILLIAM CONSTERDINE CHADWICK, trading as
Robert Chadwick & Son of Clensmore Chemical Works, Kidderminster, County of
Worcester, Manufacturers, 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 the preparation of a coloring matter suitable for use in
dyeing staining, painting or printing in black, blue, and other colors, that can be
employed as either a pigment or carmine powder, or fluid, by dyers, painters, stainers,
printers, and others, and that will enable a fabric such as wool to be dyed a perfectly
fast black in a single bath in the short space of time of from ten to thirty minutes,
without the aid of a preparation-bath or mordants, such as are now requisite for
producing a fast black with existing dyes, and which in many cases weaken or
deteriorate the fabric treated.
We are thus enabled to produce a larger amount of work in a given time, and to
obviate the deterioration of the fabric and the great expense and delay attendant on
the two bath process, which takes upwards of two hours.
For this purpose, we take either, say, 16 lbs. extract of indigo, or, say, one pound
of hard bengal indigo which has been previously ground to a fine powder and which
is put into a ten gallon earthenware vessel together with about eight pounds of pure
sulphuric acid standing at 170° Twaddle strength, these ingredients being well mixed
together and allowed to stand in a warm place for about twenty four hours or until
the acid has completely dissolved the indigo.
We then add about 1 lbs. azo-scarlet or any other scarlet that requires acid for its
developement, oz. of aniline called Atlas Violet, oz. of Nigrosin, and 2 oz. of irish
moss.
These ingredients are well mixed and are allowed to stand until the consequent
evolution of chlorine or hydrochloric acid gas has subsided which for the quantities
given takes about from 10 to 20 minutes.
We then add to the above about 3 quarts of cold water which is well stirred in.
One quart of common salt-solution of 40 Twaddle strength, having one pound o
powdered salt mixed therewith, is then stirred into the above compound, and to thi
is lastly added thirty pounds of extract of indigo of best quality.
After thorough incorporation, the compound is placed upon filters or strainers o
flannel, until the water and acid have drained off, which, with the above quantities
will take about twenty four hours.
The remaining thick paste then constitutes a dye stuff ready for use, producin
black, blue, and other colors in various shades, according to the amount of pigment
dye used, adding in the bath more or less sulphuric acid and small quantities of oth

page_text: coloring matters, such as are well known to dyers for producing required modifications
of color or shade.
It is to be understood that the whole of the above described processes are carried
out without the employment of artificial heat.
We have given certain proportions of the various ingredients by way of example,
but we do not limit ourselves to these nor to the combination of the whole of the
ingredients named, as these may be varied according to the purposes to which the
coloring matter is to be applied.
Having now particularly described and ascertained the nature of this invention and
in what manner the same is to be performed, we declare that what we claim is :-
An improved manufacture of coloring matter consisting of indigo extract, sulphuric
acid and aniline scarlet, or other scarlet soluble in acid, with or without admixture of
other ingredients treated substantially in the manner herein set forth.
Dated this 2-1 1
ABEL & IMRAY,
Agents for the Applicants.