IMPROVEMENTS IN THE PRODUCTION OF COLORS FROM NAPHTHALINE
Year: 1869

page_text: LETTERS PATENT to Astley Paston Price, of 47, Lincoln's Inn Fields,
in the County of Middlesex, Consulting Chemist, for the Invention
of "IMPROVEMENTS IN THE PRODUCTION OF COLORS FROM NAPHTHALINE."
-A communication from abroad by Doctor L. Darmstädter and
PROVISIONAL SPECIFICATION left by the said Astley Paston Prico
at the Office of the Commissioners of Patents, with his Petition,
on the 12th January 1869.
I, ASTLEY PASTON PRICE, of 17, Lincoln's Inn Fields, in the County
of Middlesex, Consulting Chemist, do hereby declare the nature of the
said Invention for "IMPROVEMENTS IN THE PRODUCTION OF COLORS FROM
NAPHTHALINE," a communication from abroad by Doctor L. Darm-
städter and Doctor H. Wichelhan, Ohemists, Berlin, Prussia, to be as
follows:-
This Invention relates to the production of colors from naphthaline,
and consists in acting upon naphthaline with concentrated sulphuric

page_text: acid, so as to obtain sulpho-naphthalic acid; sulpho-naphthalic acid or
salts of the same is then to be subjected to the action of an alkali, such
for example as caustic soda, at a high temperature, and from the resulting
product by the addition of an acid, such for example, sulphuric acid,
naphtyl alcohol or naphtylic alcohol is obtained. The naphtyl alcohol
obtained either by this or by other methods is submitted to the action of
sulphuric and nitric acids, so as to transform it into dinitro-naphtyl
alcohol, which product after purification may be employed for the
purpose of dyeing and printing.
SPECIFICATION in pursuance of the conditions of the Letters Patont,
filed by the said Astley Paston Price in the Great Scal Patent Office
on the 12th July 1869.
TO ALL TO WHOM THESE PRESENTS SHALL COME, I, ASTLEY
PASTON PRICE, of 47, Lincoln's Inn Fields, in the County of Middlesex,
Consulting Chemist, send greeting.
WHEREAS Her most Excellent Majesty Queen Victoria, by Her
Letters Patent, bearing date the Twelfth day of January, in the year
of our Lord One thousand eight hundred and sixty-nine, in the thirty-
second year of Her reign, did, for Herself, Her heirs and successors,
give and grant unto me, the said Astley Paston Price, Her special
license that I, the said Astley Paston Price, my executors, administra-
tors, and assigns, or such others, as I, the said Astley Paston Price, 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 COLORS FROM NAPHTHALINE," a communication from
abroad by Doctor L. Darmstädter and Doctor H. Wichelhaus, Chemists,
Berlin, Prussia, upon the condition (amongst others) that I, the said
Astley Paston Price, my executors or administrators, by an instrument
in writing under my hand and seal, should particularly describe and
ascertain the nature of the said Invention, and in what manner the
same was to bo performed, and cause the same to be filed in the Great

page_text: 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 Astley Paston Price, 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:-
This Invention relates to the production of colors from naphthaline,
and consists in acting upon naphthaline with concentrated sulphuric
acid, so as to obtain sulpho-naphthalic acid; sulpho-naphthalic acid or
salts of the same is then to be subjected to the action of an alkali, such
for example as caustic soda or potash, at a high temperaturo, and from
the resulting product by the addition of an acid, such for example as
sulphuric acid, naphthylic alcohol is obtained. The naphthylic alcohol
obtained either by this or by other methods is submitted to the action of
sulphuric and nitric acids, so as to transform it into dinitro-naphthylic
alcohol, which product may be employed for the purposes of dyeing and
printing.
In carrying out this Invention I proceed as follows:-About one part
by weight of naphthaline is taken, and about one part by weight of
concentrated sulphuric acid, and they are heated together at a tempera-
ture of about 100° centigrade, until the greater proportion of the
naphthaline has been converted into sulpho-naphthalic acid. This
product is then to be dissolved in water, and the solution saturated with
an alkali. The salts of sulpho-naphthalic acid thus obtained are evapo-
rated to dryness, and are fused with an alkali, such as caustic potash or
soda, or with mixtures of the same, so as to obtain compounds of
naphthalic alcohol, which upon the addition of dilute acid to the aqueous
solution the naphthylio alcohol or naphthol is precipitated and may bo
obtained in a crystalline form. The before-mentioned naphthylic alcohol
or naphthol so prepared or obtained from any other source is to bo
dissolved in about an equal weight of strong sulphuric acid, and the
solution is then gradually added to nitric acid, by proference previously
diluted with water, the temperature of which mixturo has been pre-
viously slightly elevated. The solution passes through different tints
but finally assumes a yellow color, and the yellow coloring matter
crystallizes out of the solution on cooling. This substance has been
called dinitro-naphthylic alcohol or dinitro-naphthol. The coloring
matter thus obtained is to bo freed from any adhering solution and is

page_text: then ready for use. Should it be necessary to subject the coloring
matter to a process of purification it may be purified by solution in an
alkali, ammonia for example, and be precipitated therefrom by means of
muriate of ammonia or otherwise. When this coloring matter is to be
employed for the purposes of dyeing or printing it may first be dissolved
in a solvent, such for example as alcohol, or it may be dissolved in an
alkaline solution. The pure substance, or its soluble salts, may either be
employed alone or in conjunction with other coloring matters for the
purposes of dyeing and printing in a manner as is well understood.
Having now described and particularly ascertained the nature of the 1
said Invention, and the manner in which the same is or may be used or
carried into effect, I would observe in conclusion that what is considered
to be novel and original, and therefore claimed as the Invention secured
by the herein-before in part recited Letters Patent is,―
The production of a coloring matter from naphthylic alcohol or 1
naphthol, substantially in the manner herein described, and the employ-
ment of the same for the purposes of dyeing and printing.
In witness whereof, I, the said Astley Paston Price, have to this
my Specification set my hand and seal, this Tenth day of July
One thousand eight hundred and sixty-nine.
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