IMPROVEMENTS IN MORDANTING TEXTILE FABRICS FOR DYEING AND PRINTING
Year: 1881

page_text: LETTERS PATENT to Joshua Knowles, F.C.S., of the Firm of S. Knowles and
Company, Mosley Street, Manchester, in the County of Lancaster, for an
Invention of "IMPROVEMENTS IN MORDANTING TEXTILE FABRICS FOR DYEING
AND PRINTING."
PROVISIONAL SPECIFICATION left by the said Joshua Knowles at the
Office of the Commissioners of Patents on the 26th July 1881.
JOSHUA KNOWLES, F.C.S., of the Firm of S. Knowles and Company, Mosley
Street, Manchester, in the County of Lancaster. IMPROVEMENTS IN MORDANTING
TEXTILE FABRICS FOR DYEING AND PRINTING."
«
It has hitherto been customary to use the acetates of iron and alumina for mor-
danting fabrics previous to dyeing with alizarine, madder, logwood, or other
dyeing materials; the goods so mordanted usually require the process known as
ageing before dyeing.
My Invention consists in substituting for the acetates of iron and alumina, or
mixtures of both, a solution of the double salt known to chemists as ferrous
ammonium sulphate of a suitable strength. 1½, ferrous ammonium sulphate
dissolved in one gallon of water, or 6° Twaddle's hydrometer, will give good
results. By using this salt as a mordant the fabrics are then in a fit state to be
completely dried, and are ready for dyeing without the intermediate process of
ageing; by which means also considerable economy both in time and labor are
effected, and the resulting color is superior.

page_text: f
SPECIFICATION in pursuance of the conditions of the Letters Patent filed
by the said Joshua Knowles in the Great Seal Patent Office on the
24th January 1882.
JOSHUA KNOWLES, F.C.S., of the Firm of S. Knowles and Company, Mosley
Street, Manchester, in the County of Lancaster. "IMPROVEMENTS IN MORDANTING
TEXTILE FABRICS FOR DYEING AND PRINTING."
My Invention relates to improvements in mordanting textile fabrics to be dyed
or printed, my object being to obviate the necessity of ageing the fabrics, and to
produce with considerable economy improved results.
In carrying out my Invention, in place of the acetates of iron and alumina, or
mixtures of both, commonly used for mordanting textile fabrics previous to dyeing
or printing with alizarine, madder, logwood, or other dyeing materials, I make use
of the double salt known to chemists as ferrous ammonium sulphate. I find /lb.
ferrous ammonium sulphate dissolved in one gallon water, or 6 degrees by
Twaddle's hydrometer, will give good results, but the strength of the solution may
be varied. In this solution I immerse the fabric to be dyed until sufficiently.
saturated, then take it out and dry it, and it is without further preparation in a fit
state for dyeing. When the fabric is to be printed I apply my improved mordant
in the usual manner, and dye the fabric without ageing.
By the use of my Invention the fabric mordanted may be dyed without the
intermediate process of ageing, a considerable saving is effected in time and expense,
and the resulting colour is superior.
Having stated the nature of my Invention, and described the manner of per-
forming the same,
I declare that I claim,―
The use and application, of ferrous ammonium sulphate for mordanting textile
fabrics, substantially as herein described.
In witness whereof, I, the said Joshua Knowles, have hereunto set my hand
and seal, this Twenty first day of January, One thousand eight hundred
and eighty two.
JOSHUA KNOWLES. (L.S.)