IMPROVEMENTS IN DYEING WOVEN FABRICS
Year: 1855

page_text: LETTERS PATENT to William Douglas and John Carswell, of the City
of Manchester, in the County of Lancaster, Dyers, for the Invention of
"IMPROVEMENTS IN DYEING WOVEN FABRICS."
PROVISIONAL SPECIFICATION left by the said William Douglas and
John Carswell at the Office of the Commissioners of Patents, with their
Petition, on the 20th January 1855.
We, WILLIAM DOUGLAS and JOHN CARSWELL, of the City of Manchester, in
the County of Lancaster, Dyers, do hereby declare the nature of the said
Invention for "IMPROVEMENTS IN DYEING WOVEN FABRICS" to be as follows:-
Our Invention relates to dyeing woven fabrics subsequent to the process of
padding, so as to brighten and improve the color. After padding, which has
Chitherto been the last process of colouring, we finish the dyeing process (of blue
velvets, for instance,) by a compound containing ingredients which impart a
pink or red tinge, as extracts of safflower and tartrate of soda and potash; and
for other colours we employ ingredients to harmonize with the intended colour
in a similar way.

page_text: SPECIFICATION in pursuance of the conditions of the Letters Patent, filed
by the said William Douglas and John Carswell in the Great Seal Patent
Office on the 19th July 1855..
TO ALL TO WHOM THESE PRESENTS SHALL COME, we, WILLIAM
DOUGLAS and JOHN CARSWELL, of the City of Manchester, in the County of
Lancaster, Dyers, send greeting.
WHEREAS Her most Excellent Majesty Queen Victoria by Her Royal
Letters Patent, bearing-date the Twentieth day of January, in the year of
our Lord One thousand eight hundred and fifty-five, in the eighteenth year
of Her reign, did, for Herself, Her heirs and successors, give and grant
unto us, the said William Douglas and John Carswell, Her special licence,
that we, the said William Douglas and John Carswell, our executors, adminis-
trators, and assigns, or such others as we, the said William Douglas and Jolin
Carswell; our executors, administrators, and assigns, should at any time agree
with, and no others, from time to time and at all times thereafter during the
term therein expressed, should and lawfully might make,' use, exercise, and
vend, within the United Kingdom of Great Britain and Ireland, the Channel
Islands, and Isle of Man, an Invention for "IMPROVEMENTS IN DYEING WOVEN
FABRICS," upon the condition (amongst others) that we, the said William
Douglas and John Carswell, by an instrument in writing under our hands and
seals, or under the hand and seal of one of us, should particularly describe and
ascertain the nature of the said Invention, and in what manner the same was
to be performed, and cause the same to be filed in the Great Seal Patent
Office within six calendar months next and immediately after the date of the
said Royal Letters Patent.
:.. 1. "."'
NOW KNOW YE; that we, the said William Douglas. and John Carswell,
do hereby declare the nature of the said Invention, and in what manner the
same is to be performed, to be particularly described and ascertained. in-and
by the following statement (that is to say) :-
40
Our Invention relates to dyeing woven fabrics subsequent to the process of
padding, so as to brighten and improve the colour. We finish the dyeing
process (of blue velvets, for instance,) by a compound containing ingredients
which impart a pink or red tinge, as extract of safflower and tartrate of soda
and potash; and for other colours we employ ingredients to harmonize with the
intended colour in a similar way. To obtain the blue colour with a pink or
red tinge, as above mentioned, we use the following drugs or compounds, in
any suitable proportions that may be found most useful in practice:-Prepared
salts, sulphuric acid, a mixture of prussiate of potash and prussiate of potash

page_text: pulp, tartaric acid, oxalic acid, super sulphur, sal-ammoniac, grum dragon,
carmine, and tartrate of potashand soda, gum, starch, chrome, pearlash, and
sulphuric acid. Of course we steam, wash, and clear the pieces as usual
in such processes.
Having thus described the nature and particulars of our said Invention, and
the manner of carrying it into practical effect, we desire it to be distinctly
understood that we do not confine ourselves to the exact details thereof; but
we claim the general principle herein set forth to produce a peculiar tinge and
brightness to the colours of dyed fabrics.
In witness whereof, we, the said William Douglas and John Carswell,
have hereunto set our hands and seals, this Eighteenth day of July,
One thousand eight hundred and fifty-five.
WILLI
UGLAS. (L.S.)
(L.S.)
JOHN CARSWELL.
Signed, sealed, and delivered by the within-named
William Douglas and John Carswell, in the
presence of
E. J. HUGHES,
Patent Agent,
Manchester.
presence of
E. J. HUGHES,
Patent Agent,
Manchester.