IMPROVEMENTS IN THE PREPARATION OF GREEN COLORING MATTER
Year: 1863

page_text: LETTERS PATENT to William Clark, of 53, Chancery Lane, in the
County of Middlesex, Engineer and Patent Agent, for the Invention
"IMPROVEMENTS IN THE PREPARATION OF GREEN COLORING MATTER."—
communication from abroad by Charles Jules Usèbe, Manufacturer,
of: 29, Boulevart St. Martin, Paris.
Sealed the 30th June 1863, and dated the 12th January 1863.
PROVISIONAL SPECIFICATION left by the said William Clark at the
Office of the Commissioners of Patents, with his Petition, on the 12th
January 1868.
I, WILLIAM CLARK, of 53, Chancery Lane, in the County of Middlesex,
Engineer and Patent Agent, do hereby declare the nature of the said Inven-
tion for "IMPROVEMENTS IN THE PREPARATION OF GREEN COLORING MATTER," to
be as follows:-
This Invention relates to improvements in the preparation of a green
coloring matter derived from aniline.
The following is the method of operation:-To a solution of rosaniline
contained in a mineral acid, such as sulphuric or hydrochloric acid, I add a
hydrate of an acétic nature, for example, hydrate of acetyle or aldehyde, for a
period of from 12 to 48 hours, according to the ambiant temperature and the
quantity of acid and hydrate employed, until the bath is of a greenish blue
tint. The liquor is then weakened with acidulated water, so as to avoid
precipitating the blue formed; I then add an alkaline hyposulphite a little at
a time, maintaining always an excess of acid in the bath in proportion as it is
neutralized by the alkali of the hyposulphite. The liquor is then boiled as

page_text: well for facilitating the action of the hyposulphite as for separating the excess
of sulphurous acid produced by the decomposition; the boiling liquor is then
filtered in order to separate the sulphur.
In this manner I obtain a liquid of a green tint, which will be of a yellowish
hue in proportion to the amount of hyposulphite used.
The Invention thus consists in the preparation of a green coloring matter
derived from aniline, which is soluble and suitable for dyeing purposes, by
means of a combination of reducing agents, such as hydrates and soluble
byposulphites acting on acidulated solutions of salts of rosaniline or the violet
compounds derivable from the same.
SPECIFICATION in pursuance of the conditions of the Letters Patent, filed
by the said William Clark in the Great Seal Patent Office on the 7th
July 1863.
TO ALL TO WHOM THESE PRESENTS SHALL COME, I, WILLIAM
CLARK, of 53, Chancery Lane, in the County of Middlesex, Engineer and
Patent Agent, send greeting.
WHEREAS Her most Excellent Majesty Queen Victoria, by Her Letters
Patent, bearing date the Twelfth day of January, in the year of our Lord
One thousand eight hundred and sixty-three, in the twenty-sixth year of
Her reign, did, for Herself, Her heirs and successors, give and grant unto me,
the said William Clark, Her special licence that I, the said William Clark,
my executors, administrators, and assigns, or such others as I, the said
William Clark, my executors, administrators, and assigns, should at any
time agree with, and no others, from time to time and at all times there-
after 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 "Iм-
PROVEMENTS IN THE PREPARATION OF GREEN COLORING MATTER," a communication
to me from abroad by Charles Jules Usèbe, Manufacturer, of 29, Boulevart
St. Martin, Paris, upon the condition (amongst others) that I, the said
William Clark, my executors or administrators, 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.

page_text: NOW KNOW YE, that I, the said William Clark, do hereby declare
the nature of the said Invention, and in what manner the same is to be per-
formed, to be particularly described and ascertained in and by the following
statement (that is to say):-
This Invention relates to improvements in the preparation of a green
coloring matter derived from aniline.
The following is the method of operation:-To a solution of rosaniline
contained in a mineral acid, such as sulphuric or hydrochloric acid, I add a
hydrate of an acetic nature; for example, hydrate of acetyle or aldehyde for a
period of from twelve to about forty-eight hours, according to the ambiant
temperature and the quantity of acid and hydrate employed; until the bath is
of a greenish blue, tint. The liquor is then weakened with acidulated water,
so as to avoid precipitating the blue formed; I then add an alkaline hypo-
sulphite a little at a time, maintaining always an excess of acid in the bath in
proportion as it is neutralized by the alkali of the byposulphite. The liquor is
then boiled as well for facilitating the action of the hyposulphite as for
separating the excess of sulphurous acid produced by the decomposition; the
boiling liquor is then filtered in order to separate the sulphur.
In this manner I obtain a liquor of a green tint, which will be of a yellowish
hue in proportion to the amount of hyposulphite used.
Having described the nature of this Invention, and the manner of performing
the same, I declare that what I claim as the Invention to be protected by the
herein-before in part recited Letters Patent is, the preparation of a green
coloring matter derived from aniline, which is soluble, and suitable for dyeing
and printing purposes, by means of a combination of reducing agents, such as
hydrates and soluble hyposulphites acting on acidulated solutions of salt and
rosaniline, or on the blue or violet compounds derivable from the same.
In witness whereof, I, the said William Clark, have hereunto set my
hand and seal, this Seventh day of July, in the year of our Lord
One thousand eight hundred and sixty-three.
Witness,
⚫ JAMES DAISH,
53, Chancery Lane,
London.
W. CLARK. (L.S.)