IMPROVEMENTS IN THE PRO- DUCTION OF CERTAIN COLOURING MATTERS
Year: 1875

page_text: LETTERS PATENT to Alfred Weigel, of No. 21, Mark Lane, in the
City of London, for the Invention of "IMPROVEMENTS IN THE PRO-
DUCTION OF CERTAIN COLOURING MATTERS."
Scaled the 10th March 1876, and dated the 23rd September 1875.
PROVISIONAL SPECIFICATION left by the said Alfred Weigel at
the Office of the Commissioners of Patents, with his Petition,
on the 23rd September 1875.
I, ALFRED WEIGEL, of No. 21, Mark Lane, in the City of London,
do hereby declare the nature of the said Invention for "IMPROVEMENTS
IN THE PRODUCTION OF CERTAIN COLOURING MATTERS," to be as follows:-
My Invention relates to the production of certain colouring matters,
soluble in water and suitable for dyeing, from a combination of sulphur
with acetates or equivalent salts. For example, I employ acetate of
soda which I first render anhydrous and then mix with sulphur. I
subject the mixture to an elevated temperature, as for instance, a red
heat, in a closed vessel from which air is excluded; I thus produce a

page_text: colouring matter which can be dissolved in water and employed for
dyeing or like purposes.
Acetates of other bases or other salts of analogous character may be
employed instead of acetate of soda, and the colouring properties of
the product may be thus varied. Also other non-metallic elements
may be employed instead of sulphur, such as iodine, phosphorus, and
the like.
SPECIFICATION in pursuance of the conditions of the Letters Paten
filed by the said Alfred Weigel in the Great. Seal Patent Office
on the 22nd March 1876.
TO ALL TO WHOM THESE PRESENTS SHALL COME, I, ALFRED
WEIGEL, of No. 21, Mark Lane, in the City of London, send greeting.
WHEREAS Her most Excellent Majesty Queen Victoria, by Her
Letters Patent, bearing date the Twenty-third day of September, in
the year of our Lord One thousand eight hundred and seventy-five,
in the thirty-ninth year of Her reign, did, for Herself, Her heirs and
successors, give and grant unto me, the said Alfred Weigel, Her
special license that I, the said Alfred Weigel, my executors, adminis-
trators, and assigns, or such others as I, the said Alfred Weigel, my
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 THE PRODUCTION OF CERTAIN COLOURING MATTERS," upon the condition
(amongst others) that I, the said Alfred Weigel, my executors or admi-
-nistrators, by an instrument in writing under my, or their, or one
of their hands and seals, 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 Letters Patent.
NOW KNOW YE, that I, the said Alfred Weigel, do hereby

page_text: same is to be performed, to be particularly described and ascertained
in and by the following statement thereof, that is to say :-
My Invention relates to the production of certain colouring matters,
soluble in water and suitable for dyeing, from a combination of sulphur
with acetates or equivalent salts. For example, I employ acctate of
soda which I first render anhydrous and then mix with sulphur. I
subject the mixture to an elevated temperature, as for instance, a red
heat, in a closed vessel from which air is excluded; I thus produce a
colouring matter which can be dissolved in water and employed for
dyeing or like purposes.
Acetates of other bases or other salts of analogous character may be
employed instead of acetate of soda, and the colouring properties of
the product may be thus varied. Also other non-metallic elements
may be employed instead of sulphur, such as iodine, phosphorus and
the like.
Having thus described the nature of my Invention and in what
manner the same is to be performed I claim, the production of soluble
colouring matter, by mixing acetates or equivalent salts with sulphur
or other non-metallic clements, and subjecting the mixture to heat in a
closed vessel, substantially as herein described.
In witness whereof, I, the said Alfred Weigel, have hereunto set
my hand and seal, this Twenty-first day of March, in the year
of our Lord One thousand eight hundred and seventy-six.
תתגדAT
ITTATT
ALFRED WEIGEL.
(L.S.)