CERTAIN IMPROVEMENTS IN THE MANUFACTURE OF THE EXTRACT OF MADDER
Year: 1866

page_text: LETTERS PATENT to Hector Auguste Dufrené, of No. 10, Rue de la
Fidélité, Paris, in the Empire of France, Civil Engineer, for the Invention
of "CERTAIN IMPROVEMENTS IN THE MANUFACTURE OF THE EXTRACT OF
MADDER." A communication from Mr. Jules Pernod, residing at No. 1,
PROVISIONAL SPECIFICATION left by the said Hector Auguste Dufrené
at the Office of the Commissioners of Patents, with his Petition, on the
24th December 1866.
I, HECTOR AUGUSTE DUFRENE, of No. 10, Rue de la Fidélité, Paris, in the
Empire of France, Civil Engineer, do hereby declare the nature of the said
Invention for "CERTAIN IMPROVEMENTS IN THE MANUFACTURE OF THE EXTRACT OF
MADDER," to be as follows, that is to say :-
The Invention communicated to me consists in improved means, herein-after
described, for obtaining the extract of madder for dyeing.
I take water acidulated with sulphuric or other low-priced acid, or with an
acid salt, in which I place powdered madder, or one of the known products
obtained from madder, such as garancine, and which I raise to ebullition in a
vat or other suitable vessel by means of steam or by other known means. The
whole is filtered after boiling about a quarter of an hour, and the liquid in
cooling deposits the colouring extract, which being suitably washed can be
used in the pasty condition or after being dried. I can obtain the extract in

page_text: a purer state by dissolving it in alcohol, adding water and distilling it. The
pure extract then deposits and only filtering is required, and to leave the
deposited matter to drip on the filter.
SPECIFICATION in pursuance of the conditions of the Letters Patent, filed
by the said Hector Auguste Dufrené in the Great Seal Patent Office on
the 19th June 1867.
TO ALL TO WHOM THESE PRESENTS SHALL COME, I, HECTOR
AUGUSTE DUFRENE, of No. 10, Rue de la Fidélité, Paris, in the Empire of
France, Civil Engineer, send greeting.
WHEREAS Her most Excellent Majesty Queen Victoria, by Her Letters
Patent, bearing date the Twenty-fourth day of December, in the year of our
Lord One thousand eight hundred and sixty-six, in the thirtieth year of Her
reign, did, for Herself, Her heirs and successors, give and grant unto me, the
said Hector Auguste Dufrené, Her special licence that I, the said Hector
Auguste Dufrené, my executors, administrators, and assigns, or such others
as I, the said Hector Auguste Dufrené, 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 "CERTAIN IMPROVEMENTS IN THE MANUFACTURE OF THE EXTRACT OF MADDER,"
(a communication from Mr. Jules Pernod, a person resident at No. 1, Rue
des Clés, Avignon, in the Empire of France, upon the condition (amongst
others) that I, the said Hector Auguste Dufrené, my executors or admi-
nistrators, 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.
NOW KNOW YE, that I, the said Hector Auguste Dufrené, 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 :-
The Invention communicated to me consists in improved means, herein-after
described, for obtaining the extract of madder for dyeing, and is based on the
application to the treatment of madder and its derivatives of the property.

page_text: possessed by boiling acidulated water, of dissolving the coloring principle
contained in that dyeing material, and on the slight solubility of that coloring
principle in cold acidulated water, which permits of effecting its sepa-
ration, and of utilizing indefinitely the same acidulated liquid for successive
operations.
I take water acidulated with sulphuric or other low-priced acid, or with an.
acid salt, in which I place powdered madder, or one of the known products
obtained from madder, such as garancine, and which I raise to. ebullition in a
vat or other suitable vessel by means of steam, or by other known means.
The whole is filtered after boiling about a quarter of an hour, and the liquid
in cooling deposits the coloring extract, which being suitably washed can be
used in the pasty condition, or after being dried. I can obtain the extract in
a purer state by dissolving it in alcohol, adding water and distilling. The
purified extract then deposits and only filtering is required, and to leave the
deposited matter to drip on the filter.
And having now described the nature of the said Invention, and the manner
of carrying the same into effect, I wish it to be understood that I do not
confine myself to the precise means herein laid down; but what I claim is,
the employment for the manufacture of the extract of madder of the property
possessed by boiling acidulated water, of dissolving the coloring principle in
madder, and of the slight solubility of such coloring principle in cold acidulated
water, thereby permitting of the separation of such principle and utilizing the
acidulated water, as herein-before described.
In witness whereof, I, the said Hector Auguste Dufrené, have hereunto
set my hand and seal, this Twelfth day of June, One thousand eight
hundred and sixty-seven.