IMPROVE- MENTS IN THE PRODUCTION OF COLOURS FOR DYEING."
Year: 1863

page_text: LETTERS PATENT to Dan Dawson, of Milnsbridge Chemical Works,
Huddersfield, in the County of York, for the Invention of "IMPROVE-
MENTS IN THE PRODUCTION OF COLOURS FOR DYEING."
PROVISIONAL SPECIFICATION left by the said Dan Dawson at the
Office of the Commissioners of Patents, with his Petition, on the 11th
November 1863.
I, DAN DAWSON, of Milnsbridge Chemical Works, Huddersfield, in the
County of York, do hereby declare the nature of the said Invention for
"IMPROVEMENTS IN THE PRODUCTION OF COLOURS FOR DYEING," to be as follows:-
These improvements relate to the production of all intermediate shades
(composed of red and blue) between "magenta" and blue.
In carrying out my Invention I heat together in an open or closed vessel
(the latter being preferred) iodide of allyle and rosaniline or iodide of allyle,
and any salt of rosaniline in about the following proportions, iodide of allyle,
two parts; rosaniline, one part; or two parts of iodide of allyle to one part of any
salt of rosaniline. These proportions correspond to about three equivalents
of iodide of allyle to one equivalent of rosaniline and answer very well in
practice. The temperature to which the mixture should be heated cannot be
definitely stated, as the reaction takes place at various temperatures; but the
temperatures which I have found to answer best range between 180 degrees
and 240 degrees Fahrenheit. I would here observe that it may be advantageous

page_text: in some cases to add spirits of wine to the iodide of allyle and rosaniline or
salt of rosaniline before heating them, by which means the mixture is rendered
more fluid. I may also repeat that closed vessels in which to effect the
The
change (although not absolutely necessary) are preferable to open ones.
change of colour caused by the reaction must be carefully watched and the
operation must be stopped as soon as the desired shade has been obtained.
SPECIFICATION in pursuance of the conditions of the Letters Patent, filed
by the said Dan Dawson in the Great Seal Patent Office on the
10th May 1864.
TO ALL TO WHOM THESE PRESENTS SHALL COME, I, DAN
DAWSON, of Milnsbridge Chemical Works, Huddersfield, in the County of
York, send greeting.
WHEREAS Her most Excellent Majesty Queen Victoria, by Her Letters
Patent, bearing date the Eleventh day of November, in the year of our Lord
One thousand eight hundred and sixty-three, in the 27th year of Her
reign, did, for Herself, Her heirs and successors, give and grant unto I, the
said Dan Dawson, Her special license that I, the said Dan Dawson, my
executors, administrators, and assigns, or such others as I, the said Dan
Dawson, my executors, administrators, or 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 PRODUCTION
OF COLOURS FOR DYEING," upon the condition (amongst others) that I, the said
Dan Dawson, my executors or administrators, by an instrument in writing
under my hand and seal, or under the hand and seal of one of them, 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 Dan Dawson, 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 :-
These improvements relate to the production of all intermediate shades
(composed of red and blue) between "magenta" and blue.

page_text: In carrying out my Invention, I heat together in an open or closed vessel
(the latter being preferred) iodide of allyle and rosaniline or oidide of allye
and any salt of rosaniline in about the following proportions namely, iodide of
allyle, two parts; rosaniline, one part; or two parts of iodide of allyle to one
part of any salt of rosaniline. These proportions correspond to about three
equivalents of iodide of allyle to one equivalent of rosaniline and answer very
well in practice. The temperature to which the mixture should be heated
cannot be definitely stated, as the reaction takes place at various temperatures;
but the temperatures which I have found to answer best range between one
hundred and eighty degrees and two hundred and forty degrees Fahrenheit.
I would here observe that it may be advantageous in some cases to add spirits
of wine to the iodide of allyle and rosaniline or salt of rosaniline before heating
them, by which means the mixture is rendered more fluid. I may also repeat
that closed vessels in which to effect the change (although not absolutely
necessary) are preferable to open ones. The change of colour caused by the
reaction must be carefully watched, and the operation must be stopped as soon
as the desired shade has been attained.
Having now described the nature and object of my said Invention for "Im-
provements in the Production of Colours for Dyeing," together with the
manner in which the same is to be or may be performed or carried into
practical effect, I would remark in conclusion that I claim as my Invention
the production of all intermediate shades (composed of red and blue) between
magenta" "and blue, by heating together iodide of allyle and rosaniline or
iodide of allyle and any salt of rosaniline.
In witness whereof, I, the said Dan Dawson, have hereunto set my
hand and seal, this Thirtieth day of April One thousand eight hundred
and sixty-four.