IMPROVEMENTS IN PIECE-DYED WOOLLEN FABRICS OR FABRICS COMPOSED OF WOOL IN COMBINATION WITH OTHER FIBROUS SUBSTANCES
Year: 1862

page_text: PROVISIONAL SPECIFICATION left by Henry Dyson Taylor and Edward
Robinson at the Office of the Commissioners of Patents, with their Petition,
on the 10th May 1862.
We, HENRY DYSON TAYLOR, of the Firm of John Taylor and Sons, of Hud-
dersfield, in the County of York, Manufacturers, and EDWARD ROBINSON, of
the Firm of Robinson & Slater, of the same Place, Manufacturing, Analytical,
& Consulting Chemists, do hereby declare the nature of the said Invention for
" IMPROVEMENTS IN PIECE-DYED WOOLLEN FABRICS OR FABRICS COMPOSED OF WOOL
IN COMBINATION WITH OTHER FIBROUS SUBSTANCES," to be as follows:
This Invention consists in certain methods of producing blue selvages on
piece-dyed fabrics, whether such fabrics consist of wool alone or of wool mixed
with any other fibre or material.
§1. To produce such blue selvages, the cotton, linen, or other vegetable
fibre or silk of which the selvage is to be made is first dyed an indigo blue
in the vat in the usual manner. It is then passed through a solution of
alum or any other salt which may the better enable it to bear the opera-
tions of scouring and fulling. The fabrics are next woven, scoured, fulled,
and dyed to the required color, and, if needful, "burl dyed," all in the ordi-
nary manner. Meantime we prepare a solution consisting of 10 pints of water,
4 pounds of yellow prussiate of potash, otherwise called "ferrocyanide of
potassium," 1 pint of sulphuric acid, standing at 169 degrees of Twaddle's
bydrometer, and 2 pints of acetic acid, standing at 8 degrees of Twaddle's

page_text: bydrometer. This we call the "changing liquor," which we apply to the selvages
of the fabric or cloth, either by means of a brush, a sponge, a pad, by blocks, by
a calico printer's cylinder machine, or in any other convenient manner, whether
by hand or by machinery. Lastly, the fabrics or cloths are washed in water.
It must be noted that if no preparation of iron be used in dyeing the said
fabrics or cloths, and if they are not to be "burl dyed," then the cotton or
other material for the selvages must be treated with some suitable iron mordant
before the fabric or cloth is woven.
§2. If we wish to produce a brighter blue on the selvages, we then omit tho
application of indigo to the cotton or other material, and proceed in all other
points exactly as laid down in § 1.
§3. If we wish the selvages to be of a duller blue, we apply the indigo as
in § 1, and then after the cloths have been woven, dyed, and "burl dyed," (if
needful,) and otherwise got up in the usual manner, we apply to the selvages
by any suitable method any acid, such as the tartaric, citric, or sulphuric, or
any mixture of acids or acid salts, such as may clear away other colours from
the selvages, leaving the indigo blue undestroyed.
Lastly, the fabrics or cloths are washed in water. We do not, however,
recommend this last-described process, as, without great care, the acids used
may injure the body of the cloth.
In preparing the "changing liquor" we use any mixtures of the above
ingredients which may answer the purpose; and for making the said " chang-
ing liquor we further make use of the red prussiate of potash, and of any
cyanide, ferrocyanide, ferrid-cyanide, or other compound cyanides, with any
acid or acids, or acid salts; also of hydro-ferro-cyanic acid and bydro-ferrid-
cyanic acid, and of any and every body, re-agent, compound, or mixture,
whether in the state of a gas, a vapour, a liquid, a paste, a powder, or in any
form soever capable of yielding the like results as the mixture we have
specified.