IMPROVEMENTS IN DYEING COTTON, COTTON YARNS, AND COTTON FABRICS
Year: 1886

page_text: Date of Application, 22nd Oct., 1886.
Complete Left, 14th July, 1887.
Complete Accepted, 16th Aug., 1887,
ܒ܂
I, FREDERICK ALBERT GATTY, of Hagg Works, Accrington, in the County of
Lancaster Calico Printer and Dyer do hereby declare the nature of said Invention
for IMPROVEMENTS IN DYEING COTTON, COTTON YARNS, AND COTTON FABRICS to be
as follows:
--
I have discovered that the tribasic acetate of lead, or a solution of normal
acetate of lead commonly called sugar of lead, to which a certain quantity of
ammonia has been added has the property of giving up its oxide to cotton by
simply immersing it in a solution of the tribasic acetate, and therefore the necessity
of fixing the oxide of lead by a separate process is dispensed with.
My improvements therefore consist chiefly in the application of tribasic acetate
of lead or a solution of normal acetate of lead to which a certain quantity of
ammonia has been added, for the purpose of producing on cotton, cotton yarns,
and cotton fabrics chrome yellows, chrome greens and other colours in which
oxide of lead forms the base.
To produce a chrome yellow or chrome green I simply pass the cotton, cotton
yarns, or cotton fabrics through a solution of tribasic acetate of lead, squeeze out
the excess of liquid and then dye in bichromate of potash or bichromate of soda
in the ordinary way well understood by dyers.

page_text: COMPLETE SPECIFICATION.
Improvements in Dyeing Cotton, Cotton Yarns, and Cotton Fabrics.
I FREDERICK ALBERT GATTY of Hagg Works Accrington in the County of
Lancaster Calico Printer and Dyer, do hereby declare the nature of said Invention
for IMPROVEMENTS IN DYEING COTTON COTTON YARNS AND COTTON FABRICS and in what
manner the same is to be performed, to be particularly described and ascertained
in and by the following statement :-
I have discovered that the tribasic Acetate of Lead or a solution of normal Acetate
of Lead commonly called Sugar of Lead to which a certain quantity of Ammonia has
been added has the property of giving up its Oxide to cotton by simply immersing it
in a solution of the tribasic Acetate and therefore the necessity of fixing the Oxide of
Lead by a separate process is dispensed with.
My improvements therefore consist chiefly in the application of tribasic Acetate of
Lead or a solution of normal Acetate of Lead to which a certain quantity of Ammonia
has been added for the purpose of producing on cotton cotton yarns and cotton fabrics
Chrome Yellows Chroine Greens and other colours in which Oxide of Lead forms
the base.
To produce a Chrome Yellow or Chrome Green 1 simply pass the cotton cotton
yarns or cotton fabrics through a solution of tribasic Acetate of Lead squeeze out the
excess of liquid and then dye in Bichromate of Potash or Bichromate of Soda in the
ordinary way well understood by Dyers.
In practice I find that the following process gives good results :-
I prepare tribasic Acetate of Lead by making a solution of thirty pounds of ordinary
Acetate of Lead in say ten gallons of water but the quantity of water is immaterial
and to this solution I add one gallon of liquid Ammonia containing twenty five per
cent. of Ammonia. If more convenient the Ammonia can be mixed with the Acetate
of Lead in the dry state but in this case the mixture must be allowed to stand for a
few hours before using it.
To produce a Yellow shade I impregnate the cotton cotton yarns or cotton fabrics
with the solution of tribasic Acetate of Lead at six degrees of Twaddle's hydrometer
but I vary the strength of the solution according to the shade required. I squeeze
out from the impregnated material the excess of liquid and then dye in a solution of
Bichromate of Soda or Bichromate of Potash in the ordinary way well understood
by Dyers and Printers.
To produce a green shade I follow exactly the same process as above described for
dyeing yellow but before impregnating the materials with the tribasic Acetate of Lead
solation I dye them blue in any convenient way.

page_text: To produce other colours of which Oxide of Lead forms the base or mordant the
materials are simply passed through the solution of tribasic Acetate of Lead and are
washed when ready for dyeing in the same way as when Oxide of Lead has been
fixed by the old process.
Having now particularly described and ascertained the nature of my said Invention
and in what manner the same is to be performed I declare that what I claim is-
1. The use and application of tribasic Acetate of Lead or normal Acetate of Lead
combined with Ammonia for the purpose of fixing upon cotton materials the Oxide
of Lead forming the base or mordant of various colours substantially as and for the
purposes herein described.
2. Cotton materials upon which Oxide of Lead has been fixed by impregnating
said materials with tribasic Acetate of Lead substantially in the manner and for the
purposes herein specified.