IM- PROVEMENTS IN THE MANUFACTURE OF A BLUE COLORING MATTER
Year: 1862

page_text: LETTERS PATENT to William Clark, of 53, Chancery Lane, in the County
of Middlesex, Engineer and Patent Agent, for the Invention of "IM-
PROVEMENTS IN THE MANUFACTURE OF A BLUE COLORING MATTER."-A com-
munication from abroad by Mr. Charles Philippe Collin, of 29, Boulevart
St. Martin, Paris, Merchant.
Sealed the 17th February 1868, and dated the 4th September 1862.
PROVISIONAL SPECIFICATION left by the said William Clark at the
Office of the Commissioners of Patents, with his Petition, on the 4th
September 1862.
I, WILLIAM CLARK, of 58, 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 MANUFACTURE OF A BLUE COLORING MATTER," to
be as follows:-
This Invention relates to the manufacture of a blue coloring matter. For
this purpose I take equal parts of aniline red, and crystallized toluidine, and
heat them for five or six hours at a temperature not exceeding 388 degrees
Fahrenheit, and of not less than 334 degrees Fahrenheit, after which time a
paste of a beautiful deep blue color is produced of a slightly violet hue. This
raw paste contains besides the blue coloring matter traces of red, which has
not been transformed, and also an excess of toluidine; in order to purify it I

page_text: boil the paste with dilute sulphuric or muriatic acids, which form salts very
soluble in toluidine and aniline red without injuring the blue. A mixture of
one part of common muriatic acid with cight to ten parts of water is preferable
for effecting this purification. The matters are boiled in the diluted acid until
there is no longer any traces of red color in the washing waters. The insoluble
residue will be pure blue, which may be used for dyeing and printing. The
Invention thus consists in the manufacture of a blue coloring matter by means
of the reactions before described.
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 February 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 Fourth day of September, in the year of our Lord One
thousand eight hundred and sixty-two, in the twenty-sixth year of Her reign
did, for IIerself, 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 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 MANU-
FACTURE OF A BLUE COLORING MATTER," a communication to me from abroad
by Mr. Charles Philippe Collin, of 29, Boulevart St. Martin, Paris, Merchant,
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 tho
nature of the said Invention, and in what manner the same was to be per-
formed, 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 per-

page_text: formed, to be particularly described and ascertained in and by the following
statement (that is to say):―
This Invention relates to the manufacture of a blue coloring matter. For
this purpose I take equal parts of aniline red, and crystallized tolnidine, and
heat them for five or six hours at a temperature not exceeding three hundred
and twenty-four degrees Fahrenheit, and of not less than two hundred and
seventy degrees, after which time a paste of a beautiful deep blue color is
produced of a slightly violet hue. This raw paste contains besides the blue
coloring matter traces of red which has not become changed, and also an
excess of tolnidine; in order to purify it I boil the paste with dilute sulphuric
or muriatic acids, which form salts very soluble in tolnidine and red aniline
without injuring the blue. A mixture of one part of common muriatic acid
with eight to ten parts of water is preferable for effecting this purification.
The matters are boiled in the diluted acid until there is no longer any traces
of red color in the washing waters. The insoluble residue will be pure blue,
which may be used for dyeing and printing.
Having described the nature of this Invention, and the manner of per-
forming 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 manufacture of a
blue coloring matter in the manner and as herein-before described.
In witness whoreof, I, the said William Clark, have hereunto set my
hand and seal, this Twenty-seventh day of February, in the year
of our Lord One thousand eight hundred and sixty-three.
25 Witness,
W. G. E. SWINNOCK,
58, Chancery Lane,
London.
W. CLARK. (L.S.)