IMPROVE- MENTS IN THE MANUFACTURE OF GREEN COLORING MATTER
Year: 1866

page_text: LETTERS PATENT to William Clark, of 53, Chancery Lane, in the County
of Middlesex, Engineer and Patent Agent, for the Invention of "IMPROVE-
MENTS IN THE MANUFACTURE OF GREEN COLORING MATTER."-A communi-
cation from abroad by Jules Albert Schlumberger, Chemist, of 29,
Boulevart St. Martin, Paris.
Sealed the 24th May 1867, and dated the 30th November 1866.
PROVISIONAL SPECIFICATION left by the said William Clark at the Office
of the Commissioners of Patents, with his Petition, on the 30th November
1866.
I, WILLIAM CLARK, of 53, Chancery Lane, in the County of Middlesex,
Engineer and Patent Agent, do hereby declare the nature of the said Invention
for "IMPROVEMENTS IN THE MANUFACTURE OF GREEN COLORING MATTER," to be as
follows:-
Aniline green has been obtained by treating rosaniline or its salts, which
are dissolved in a mineral acid and then treated by an hydrate of an acetic
nature, such as aldehyde; the rosaniline blue formed by the above reaction

page_text: is treated by an alkaline hyposulphite, and it is by introducing the sulphur
element into this blue that the green coloring matter is obtained.
The new green color of this Invention differs essentially from rosaniline green,
and possesses advantages in its manufacture and application both as regards
increased yield and economy, and the richness of the color produced. I substi-
tute a base of rose toluidine for the rosaniline serving as the base in the manu-
facture of the green above mentioned, and I desire it to be particularly under-
stood that aniline does not enter into the composition of the rose toluidine,
and in this consists the difference between the present Invention and that first
mentioned. In order to make the green from toluidine I dissolve one part of
the rose toluidine or salts of the same in one and a half parts of sulphuric acid,
and add to this solution about four parts of aldehyde. After a certain period
of contact the matters become changed to a blue, when I pour in a heated
solution of two parts of byposulphite of soda to one hundred parts of water.
Any other matter capable of adding the sulphur constituent to the rose
toluidine blue may also serve in the manufacture of the improved toluidine
green.
This Invention thus consists in the manufacture and application of a new
green color derived from rose toluidine or toluidine, that being the alkaloid
serving as the base of toluidine red.
SPECIFICATION in pursuance of the conditions of the Letters Patent, filed
by the said William Clark in the Great Seal Patent Office on the 28th
May 1867.
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 Thirtieth day of November, in the year of our Lord
One thousand eight hundred and sixty-six, in the thirtieth 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 exe-
cutors, 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 thereafter during the term therein
expressed, should and lawfully might make, use, exercise, and vend, within

page_text: the United Kingdom of Great Britain and Ireland, the Channel Islands, and
Isle of Man, an Invention for "IMPROVEMENTS IN THE MANUFACTURE OF GREEN
COLORING MATTER," a communication to me from abroad by Jules Albert
Schlumberger, Chemist, of 29, Boulevart St. Martin, Paris, upon the con-
dition (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.
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 performed,
to be particularly described and ascertained in and by the following statement
(that is to say) :-
Aniline green has been obtained by treating rosaniline or its salts, which
are dissolved in a mineral acid and then treated by an hydrate of an acetic
nature such as aldehyde; the rosaniline blue formed by the above reaction
is treated by an alkaline hyposulphite, and it is by introducing the sulphur
element into this blue that the green coloring matter is obtained.
The new green color of this Invention differs essentially from rosaniline
green, and possesses advantages in its manufactuture and application both as
regards increased yield and economy, and the richness of the color produced.
I substitute a base of rose toluidine for the rosaniline serving as the base in
the manufacture of the green above mentioned, and I desire it to be particu-
larly understood that aniline does not enter into the composition of the rose
toluidine green, and in this consists the difference between the present Invention
and that first mentioned. In order to make the green from toluidine I dissolve
one part of rose toluidine or salts of the same in one and a half parts of sul-
phuric acid, and add to this solution about four parts of aldehyde; it should
be understood that if a base of rose toluidine be employed twenty-five per cent.
less is required than when one of its salts is used. After a certain period of
contact the matters become changed to a blue, when I pour in a heated
solution (at about one hundred and seventy degrees Fahrenheit) of two parts
of byposulphite of soda to one hundred parts of water. Any other matter
capable of adding the sulphur constituent to the rose toluidine blue may also
serve in the manufacture of the improved toluidine green.
Having described the nature of the said Invention, and the manner of per-
forming the same, I declare that what I claim as the Invention to be protected

page_text: by the herein-before in part recited Letters Patent is, the manufacture and
application of a new green color derived from rose toluidine prepared in the
manner described.
In witness whereof, I, the said William Clark, have bereunto set my
hand and seal, this Twenty-fifth day of May, in the year of our Lord 5
One thousand eight hundred and sixty-seven.
W. CLARK. (L.S.)