IMPROVEMENTS IN THE PRODUCTION OF COLOURING MATTERS SUITABLE FOR DYEING AND PRINTING
Year: 1882

page_text: LETTERS PATENT to Joseph Anthony Dixon, of 151, St. Vincent Street,
Glasgow, in the County of Lanark, North Britain, Solicitor, for an Invention
of "IMPROVEMENTS IN THE PRODUCTION OF COLOURING MATTERS SUITABLE
FOR DYEING AND PRINTING." A communication from abroad by Dr. Carl
Koenig, of Hæclist-am-Main, in the Empire of Germany, a Director of the
Farbwerke vorm: Meister, Lucius, and Brüning, a Company carrying on
business as Chemical Manufacturers.
PROVISIONAL SPECIFICATION left by the said Joseph Anthony Dixon at the
Office of the Commissioners of Patents on the 9th February 1882.
JOSEPH ANTHONY DIXON, of 151 St. Vincent Street, Glasgow, in the County
of Lanark, North Britain, Solicitor. "IMPROVEMENTS IN COLOURING MATTERS
SUITABLE FOR DYEING AND PRINTING." [A communication from abroad by
Dr. Carl Koenig, of Hochst-am-Main, in the Empire of Germany, a Director of the
Farbwerke vorm: Meister, Lucius, and Brüning, a Company carrying on business
as Chemical Manufacturers.]
For the conversion of alizarine blue into a compound soluble in water I can use,
instead of the bisulphites of the alkalis as described in the Provisional Specification
of a Patent granted to me dated 18th October A.D. 1881 No. 4531, the neutral
sulphite of ammonia, and the nature of my present Invention consists in the use of
the neutral sulphite of ammonia instead of the said bisulphites for the purpose of
effecting the said conversion.
The mode of performing my present Invention is as follows:-Alizarine blue in
form of a paste of 10° colouring matter or in the form of an alkaline salt of the
Bаme, is mixed thoroughly with a concentrated solution of neutral sulphite of
ammonia. This mixture is for several days exposed to a temperature of 860-104°
Fahrenheit (30°-40° centigrade). After this time the greatest part of the
alizarine blue will have dissolved and the liquid will have become of a dark yellow
colour. This solution is filtered and the new compound, which is soluble in water,
precipitated by the addition of common salt.

page_text: SPECIFICATION in pursuance of the conditions of the Letters Patent filed
by the said Joseph Anthony Dixon in the Great Seal Patent Office on the
9th June 1882.
JOSEPH ANTHONY DIXON, of 151 St. Vincent Street, Glasgow, in the County of
Lanark, North Britain, Solicitor. "IMPROVEMENTS IN THE PRODUCTION OF
COLOURING MATTERS SUITABLE FOR DYEING AND PRINTING." A communication
from abroad by Doctor Carl Koenig of Hochst-am-Main in the Empire of
Germany, a Director of the Farbwerk vorm, Meister, Lucius and Brüning, a
Company carrying on business as Chemical Manufacturers.
For the conversion of alizarine blue into a compound soluble in water I can use,
instead of the bisulphites of the alkalis (as described in the Provisional Specification
of a Patent granted to me dated 18th October A.D. 1881, No. 4531, and also in
the Complete Specification of said Patent filed in the Great Seal Patent Office, on
the 11th April, A.D. 1882, that is to say since the date of the Provisional Specifi-
cation of this Invention): the nentral sulphite of ammonia, and the nature of my
present Invention consists in the use of the neutral sulphite of ammonia instead of
the said bi-sulphites for the purpose of effecting the said conversion.
The mode of performing my present Invention is as follows:-Alizarine blue in
form of a paste of 10% colouring matter, or in the form of an alkaline salt of
the same, is mixed thoroughly with a concentrated solution of neutral sulphite of
-ammonia. This mixture is for several days exposed to a temperature of from 86°
to 104° Fahrenheit (30°-40° centigrade). After this time the greatest-part-of-the-
alizarine blue will have dissolved and the liquid will have become of a dark yellow
colour. This solution is filtered, and the new compound, which is soluble in water,
precipitated by the addition of common salt.
Having now described and particularly ascertained the nature of the said
Invention, and the manner in which the same is or may be carried into effect, I
would observe in conclusion, that what I consider novel and original, and therefore
claim as the Invention secured to me by the hereinbefore in part recited Letters
Patent is:-
The preparation of a compound of alizarine blue soluble in water by acting on
alizarine blue, or its alkaline salts, with neutral sulphite of ammonia, and separating
the new compound so formed all in manner herein before described.
In witness whereof I the said Joseph Anthony Dixon, have hereunto set my
hand and seal this Eighteenth day of May in the year of our Lord One
thousand eight hundred and eighty two. .
JOSEPH ANTHONY DIXON. (1.S.)