AN IMPROVED METHOD OF INDIGO BLUE DYEING
Year: 1858

page_text: LETTERS PATENT to John Brazil, of Manchester, in the County of Lan-
caster, Calico Printer, and Joseph McKinnell, of the same Place, Calico
Printer, for the Invention of "AN IMPROVED METHOD OF INDIGO BLUE
DYEING."
Sealed the 25th February 1859, and dated the 30th August 1858.
PROVISIONAL SPECIFICATION left by the said John Brazil and Joseph
McKinnell at the Office of the Commissioners of Patents, with their
Petition, on the 30th August 1858.
We, JOHN BRAZIL, of Manchester, in the County of Lancaster, Calico
Printer, and JOSEPH MCKINNELL, of the same Place, Calico Printer, do hereby
declare the nature of the said Invention for "AN IMPROVED METHOD OF INDIGO
BLUE DYEING," to be as follows:-
This improvement consists in printing or covering the face side of the fabric
with certain chemical substances, as, for instance, an oxide of manganese, or
other substances of a similar nature, in order to draw or attract the indigo in
the dye vat more to the face side than to the back of the fabric, so that when
finished the face side shall present a dark blue and the back a light blue.

page_text: SPECIFICATION in pursuance of the conditions of the Letters Patent, filed
by the said John Brazil and Joseph McKinnell in the Great Seal Patent
Office on the 28th February 1859.
TO ALL TO WHOM THESE PRESENTS SHALL COME, we, JOHN
BRAZIL, of Manchester, in the County of Lancaster, Calico Printer, and
JOSEPH MCKINNELL, of the same Place, Calico Printer, send greeting.
WHEREAS Her most Excellent Majesty Queen Victoria, by Her Letters
Patent, bearing date the Thirtieth day of August, in the year of our Lord
One thousand eight hundred and fifty-eight, in the twenty-second year of Her
reign, did, for Herself, Her heirs and successors, give and grant unto us, the
said John Brazil and Joseph McKinnell, Her special license that we, the said
John Brazil and Joseph McKinnell, our executors, administrators, and assigns,
or such others as we, the said John Brazil and Joseph McKinnell, our
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 "AN IMPROVED METHOD OF INDIGO
BLUE DYEING," upon the condition, amongst others, that we, the said John
Brazil and Joseph McKinnell, by an instrument in writing under our hands and
seals, should particularly describe and ascertain the nature of the said Inven-
tion, 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 we, the said John Brazil and Joseph McKinnell,
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 improvement consists in printing or covering the face side of the fabric
with certain chemical substances in order to draw or attract the indigo in the
dye vat more to the face side than to the back of the fabric, so that when
finished the face side shall present a dark blue and the back a light blue
color.
For this purpose we employ a salt of manganese, preferring the sulphate or
muriate of manganese; but it will be obvious to chemists practically
acquainted with indigo blue dyeing, that other analogous chemical substances
will have a similar effect. This salt of manganese or other chemical substance
is to be printed, "padded," or entirely cover one face or side of the fabric only,

page_text: so as to cause the indigo in the vat to impregnate or become attached more
quickly to one side of the fabric than to the other, by which method a
considerable saving is effected.
Having now described the nature of our said Invention, and in what manner
the same is to be performed, we wish it to be understood that what we claim
as the Invention intended to be secured by the said Letters Patent is, the
method of indigo dyeing above described, whereby the indigo is attracted or
caused to appear more on one than the other side of the fabric.
In witness whereof, we, the said John Brazil and Joseph McKinnell,
have hereunto set our hands and seals, this Twenty-sixth day of
February, in the year of our Lord One thousand eight hundred and
fifty-nine.
JOHN BRAZIL.
(L.S.)
JOSEPH MCKINNELL. (L.S.)
JOHN BRAZIL.
(L.S.)
JOSEPH MCKINNELL. (L.S.)