IMPROVE- MENTS IN OBTAINING VIOLET COLORING MATTERS
Year: 1867

page_text: LETTERS PATENT to Ernest Smith, of Glasgow, in the County of Lanark,
North Britain, Manufacturing Chemist, for the Invention of "IMPROVE-
MENTS IN OBTAINING VIOLET COLORING MATTERS."
Sealed the 12th November 1867, and dated the 15th May 1867..
PROVISIONAL SPECIFICATION left by the said Ernest Smith at the
Office of the Commissioners of Patents, with his Petition, on the
15th May 1867.
I, ERNEST SMITH, of Glasgow, in the County of Lanark, North Britain,
Manufacturing Chemist, do hereby declare the nature of the said Invention
for "IMPROVEMENTS IN OBTAINING VIOLET COLORING MATTERS," to be as follows,.
that is to say -
This Invention consists in obtaining violet coloring matters by treating.
rosaniline or a salt thereof with chloride of mesityl, and in obtaining violet
coloring matters by treating rosaniline or a salt thereof with the substance
obtained by treating with bromine the oil obtained by the destructive distil-
lation of rubber or gutta percha.
The proportions of the ingredients may be varied, but good results are.
obtainable in one case with one part by weight of rosaniline or its salt dissolved

page_text: in about six parts of strong methylated spirit with three parts of the chloride
of mesityl. The mixture is heated in a closed vessel to about 212 degrees
Fahrenheit for about eighteen hours, or to a higher temperature for a shorter
time, the resulting violet coloring matter being of a bluer shade accordingly
as the temperature employed or the quantity of chloride of mesityl is greater.
The designation chloride of mesityl is berein applied to the substance also
sometimes called chloropropylene, and obtained by treating acetone with
gaseous hydrochloric acid. Good results are also obtained with similar pro-
portions of rosaniline or its salt and the bromine derivative of the oil of rubber
or gutta percha, the mixture being heated to a temperature of about 280
degrees Fahrenheit for about six hours.
SPECIFICATION in pursuance of the conditions of the Letters Patent, filed
by the said Ernest Smith in the Great Seal Patent Office on the
14th November 1867.
TO ALL TO WHOM THESE PRESENTS SHALL COME, I, ERNEST
SMITH, of Glasgow, in the County of Lanark, North Britain, Manufacturing
Chemist, send greeting.
WHEREAS Her most Excellent Majesty Queen Victoria, by Her Letters
Patent, hearing date the Fifteenth day of May, in the year of our Lord
One thousand eight hundred and sixty-seven, in the thirtieth year of Her
reign, did, for Herself, Her heirs and successors, give and grant unto me, the
said Ernest Smith, Her special licence that I, the said Ernest Smith, my
executors, administrators, and assigns, or such others as I, the said Ernest
Smith, 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 OBTAINING
VIOLET COLORING MATTERS," upon the condition (amongst others) that I, the
said Ernest Smith, 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 Ernest Smith, do hereby declare the
nature of my 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 in writing, that is to say :-
My said Invention consists in obtaining violet coloring matters by treating
rosaniline or a salt thereof with chloride of mesityl, and in obtaining violet
coloring matters by treating rosaniline or a salt thereof with the substance
obtained by treating with bromine the oil obtained by the destructive distil-
lation of rubber or gutta percha.
The proportions of the ingredients and the mode of conducting the opera-
tions may be varied; but in order that my Invention and. the manner of
performing the same may be properly understood I will proceed to particularly
describe what I believe to be the best way of carrying it out, and which
has in practice given very good results.
.
=
I take one part (by weight) of a salt of rosaniline, three parts chloride of
imesityl, and four parts of methylated spirit, and heat the whole in a close
vessel to from 212 to 250 degrees Fahrenheit for about eighteen hours. An
open vessel may be used quite as effectively, provided that there is fitted to it
any convenient appliance for condensing any vaporised matters, and returning.
them to the vessel. It is advantageous to add one part of dry lime to the
mixture for the purpose of absorbing any acid set free, and the color is thereby
improved. It is also advantageous when using the color in dyeing to put a
small quantity of carbonate of soda into the dye bath before adding the coloring
matter. The bromine is recovered from the coloring matter by boiling it with
soda, after which the coloring matter is acidified, and may be dissolved in
methylated spirit, and filtered or decanted from insoluble impurities, when it
will be ready for use; or it may be evaporated to a dry state for commercial
purposes. The designation chloride of mesityl is herein applied to the sub-
stance also sometimes called chloropropylene, and obtained by treating acetone
with gaseous hydrochloric acid. Good results are also obtainable with similar
proportions of rosaniline or its salt and the bromine derivative of the oil of
rubber or gutta percha, and the operations are to be conducted in the same
manner, excepting that the matters must be heated to a temperature from 280
to 300 degrees Fahrenheit for about six hours.
Having thus particularly described my said Invention, and the manner in
which the same is to be performed, I have to state that I do not restrict myself
to the precise details herein-before specified; but that what I believe to be novel
and original and claim as the Invention secured to me by the herein-before

page_text: in part recited Letters Patent is, the producing of violet coloring matters by
the action on rosaniline or on a salt thereof of chloride of mesityl, or of a
bromine derivative of oil obtained from rubber or gutta percha as herein-before
described.
In witness whereof, I, the said Ernest Smith, have hereunto set my
hand and seal, this Thirteenth day of November, in the year of our
Lord One thousand eight hundred and sixty-seven.
Witness,
EDMUND HUNT,
Patent Agent,
Glasgow.
ERNEST SMITH. (L.S.)