New Process for Mordanting or Fixing Mordants on Worsted or Woollen Fibre and upon Mixed Fibres of Wool, Cotton, Silk, Jute, and Hair.
Year: 1887

page_text: Date of Application, 25th June, 1887
Complete Left, 10th Mar., 1888
Complete Accepted, 20th Apr., 1888
New Process for Mordanting or Fixing Mordants on Worsted or
Woollen Fibre and upon Mixed Fibres of Wool, Cotton, Silk,
Jute, and Hair.
WILLIAM CROWTHER and JOHN CROWTHER Mill Street Dyeworks, Dewsbury, in
the County of York, Dyers, do hereby declare the nature of our invention for FIXING
MORDANTS UPON WORSTED OR WOOLLEN FIBRE OR UPON MIXED FIBRES OF WOOL,
COTTON, SILK, JUTE &c. to be as follows:-
The mordants we employ and fix by this process are especially the metallic Acetates,
The Acetate of Alumina (Red Liquor) Acetate of Copper, Acetate of Iron, (pyrolig-
nite of iron) Acetate of Chromium, either separately or conjointly.
We can by the use of these metallic Acetates, mordant either worsted or woollen
fibres, or mixed fibres of wool, cotton, silk &c. so that they can be dyed by the use of
dyewares & colors now known and in general use.
Dated this 24th dow of June 1887

page_text: WILLIAM CROWTHER and JOHN CROWTHER Mill Street Dyeworks, Dewsbury, in
the County of York, Dyers, do hereby declare the nature of our invention for
FIXING MORDANTS UPON WORSTED OR WOOLLEN FIBRE OR UPON MIXED FIBRES OF
WOOL, COTTON, SILK, JUTE &o., and in what manner the same is to be per-
formed, to be particularly described and ascertained in and by the following
statement:—
The mordants we employ and fix by this process are especially the metallic acetates,
The Acetate or Alumina (Red Liquor) Acetate of Copper, Acetate of Iron (Pyro-
lignite of Iron) Acetate of Chromium, either seperately or conjointly.
We can by the use of these metallic Acetates, mordant either worsted or woollen
fibres, or mixed fibres of wool, cotton, silk &c., so that they can be dyed by the use of
dyewares and colors now known and in general use.
As an example for carrying out this process of mordanting these various fibres by
one process; We make a cold or tepid solution of any of these metallic acetates or a
inixture of them of about from 3 to 6° Twaddle, and work the fibres previously
enumerated or any combination of them either as loose wool, yarn, or cloth, (herein-
after all called goods) in this bath for about forty-five or fifty minutes, or until well
saturated with the solution. We then wring out the goods and allow them to remain
in this state for several hours, to allow the various fibres to become thoroughly
impregnated with the mordants used: we now take the goods and dry them perfectly,
which expels the acetic acid of the acetates, and thus leaves the insoluble oxides of the
metal or metals used firmly fixed in and upon the fibres.
The goods are now washed in order to
mordant, and they are then ready for dyeing.
done by the use of dyewares and colors now in
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
wash off any unfixed or superfluous
The dyeing of the various colors being
general use.
Firstly A new process by which the various fibres of worsted, wool, cotton, Silk,
Jute, or Hair, or any mixture or combination of the same, can be mordanted by one
and the same process.
Secondly-That colors dyed by this new process of mordanting are faster and

page_text: more durable: The Blacks and Blues will not turn green by exposure to the air or
Sun, such as is the case with these colors mordanted as at present, by the use of
Chromic Acid, or its compounds of potash or Soda.
Thirdly That goods mordanted by this process, and dyed in the usual manner, are
not worked and impoverished so much by the dyeing processes: That by avoiding
the corrosive action of the Chromic acid now used, the goods when dyed and finished
are fuller and softer to the touch, and the handle of such goods approaches more to
that of goods in the undyed state.
Dated thin Ninth dr. of ML 1000
WILLIAM CROWTHER.
JOHN CROWTHER.