AN IMPROVED METHOD OP PREPARING INDIGO POR THE PURPOSE OF DYING OF WOOL, SILK, LINEN, COTTON, AND OTHER ARTICLES AND GOODS MADE AND MANUFACTURED OF THE SAME, AND POR GIVING THE BLUE SHADES TO ALL KINDS OF LINENS, WOOLLENS, PAPER, AND OTHER. SUBSTANCES. IN. A MORE PERFECT. MANNER THAN HITHERTO DISCOVERED
Year: 1797

page_text: TO ALL TO WHOM THESE PRESENTS SHALL COME, I JOSEPH
BARTON; of the Parish of Saint Botolpli, Bishopsgate, in tlie City of London,
Chymist, send greeting.
WHEREAS His most Excellent Majesty King George' the Third did, by
His Letters Patent under the Great Seal of Great Britain, bearing date at
Westminster, the Twenty-fifth day of March, in the thirty-seventh year of His
reign, give and grant unto me, the said Joseph Barton, His especial licence
that I, the said Joseph Barton, during the term of years therein mentioned,
should and lawfully might use,. exercise, and vend, within England, Wales,
and Town of Berwick-upon-Tweed, my Invention of "AN IMPROVED METHOD
OP PREPARING INDIGO POR THE PURPOSE OF DYING OF WOOL, SILK, LINEN, COTTON,
AND OTHER ARTICLES AND GOODS MADE AND MANUFACTURED OF THE SAME, AND POR
GIVING THE BLUE SHADES TO ALL KINDS OF LINENS, WOOLLENS, PAPER, AND
OTHER. SUBSTANCES. IN. A MORE PERFECT. MANNER THAN HITHERTO DISCOVERED;" in
which said Letters Patent there is contained a proviso, obliging me, the said
Joseph Barton; by an instrument in writing under my hand and seal, to cause
a particular description of the nature of my said Invention, and in what manner
the same is to be performed, to be inrolled in His Majesty's High Court
of Chancery within one calendar month after the date of the said recited
Letters Patent, as in and by the same (relation being thereunto bad) may
more fully and at large appear.

page_text: NOW KNOW YE, that in compliance with the said proviso, I, the said
Joseph Barton, do hereby declare that my said Invention is described in
manner following, that is to say:-
In consequence of the infinite variety in the quality of indico, it is wholly
impossible to state the quantity of the different materials necessary in the
processes of the preparation; these must in a great measure depend on the
quantity of colouring principle contained in the indico acted upon.
The indico being finely ground as possible, and its quality as to quantum
and colour ascertained by its perfect solution in acid or alkaline solvents, a
sufficient quantity of tin, iron, zinc, or allum, or all or any of them combined
to give a fixing base to the colouring matter of indico, is added, carefully
neutrallizing any superabundance of solvents used in dissolving the indico and
metals, which would otherwise injure the durability and the beauty of the
colour, and render it more difficult of combination with other colours and
substances used in dying and preparing goods for that purpose, for the powerful
acids or alkalies necessary to dissolve indico destroy many and injure nearly all
dying drugs or materials.
In witness whereof, I, the said Joseph. Barton, have bereunto set
my hand and seal, this Twenty-fourth day of April, in the year of
our Lord One thousand seven hundred and ninety-seven.
JOS. BARTON. (L.B.)
AND BE IT REMEMBERED, that on the same Twenty-fourth day of April,
in the year above mentioned, the aforesaid Joseph Barton came before our
Lord the King in His Chancery, and acknowledged the Specification afore-
said, and all and every thing therein contained, in form above written. And
also the Specification aforesaid was stamped according to the tenor of the
.