IMPROVEMENTS IN THE PREPARATION AND EMPLOYMENT OF INDIGO BLUE -
Year: 1873

page_text: LETTERS PATENT to Alexander Melville Clark, of 53, Chancery Lane,
in the County of Middlesex, Patent Agent, for the Invention of
"IMPROVEMENTS IN THE PREPARATION AND EMPLOYMENT OF INDIGO BLUE
- A communication from abroad by Jerome Marble, of
Worcester, County of Worcester, and State of Massachusetts,
United States of America.
DYE."
-
PROVISIONAL SPECIFICATION left by the said Alexander Melville
Clark at the Office of the Commissioners of Patents, with his :
Petition, on the 29th April 1873.
I, ALEXANDER MELVILLE CLARK, of 53, Chancery Lane, in the County
5 of Middlesex, Patent Agent, do hereby declare the nature of the said
Invention for "IMPROVEMENTS IN THE PREPARATION AND EMPLOYMENT. OF INDIGO.
BLUE DYE," to be as follows:
-
To prepare an indigo blue dye for coloring wool and cotton without
the use of woad, madder syrup, or vitrol, or any fermentation, I take
0 equal parts of lime and soda ash in the proportion of two (2) of cach

page_text: SPECIFICATION in pursuance of the conditions of the Letters Patent,
filed by the said Alexander Melville Clark in the Great Scal Patent
Office on the 23rd September 1873.
TO ALL TO WHOM THESE PRESENTS SHALL COME, I, ALEXANDER
MELVILLE CLARK, of 53, Chancery Lane, in the County of Middlesex,
Patent Agent, send greeting.
WHEREAS Her most Excellent Majesty Queen Victoria, by Her
Letters Patent, bearing date the Twenty-ninth day of April, in the year
of our Lord One thousand eight hundred and seventy-three, in the
thirty-sixth year of Her reign, did, for Herself, Her heirs and successors,
give and grant unto me, the said Alexander Melville Clark, Her special.
licence that I, the said Alexander Melville Clark, my exccutors, adminis-
trators, and assigns, or such others as I, the said Alexander Melville
Clark, 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
"IMPROVEMENTS IN THE PREPARATION AND EMPLOYMENT OF INDIGO BLUE DYE,"
a communication to me from abroad by Jerome Marble, of Wor-
cester, County of Worcester, and State of Massachusetts, United States
of America, upon the condition (amongst others) that I, the said
Alexander Melville Clark, my executors or administrators, by an instru-
ment in writing under my, or their, or one of their 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 I, the said Alexander Melville Clark, 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:-
To prepare an indigo blue dye, I take equal parts of lime and soda ash,
in the proportion of two (2) of each by weight to one (1) by weight of
indigo, to be ultimately used. I slake the lime in water and dissolve
the soda ash in hot water, and mix the two. From this mixture I

page_text: Also the compound composed of muriate of tin crystals and soda ash
called composition No. 2.
.
Also the composition composed of compositions Nos. 1 and 2, and
called composition No. 3 in the foregoing Specification, substantially in
the proportions and for the purpose herein set forth.
I also claim the mode of using the composition No. 3, substantially
as described.
In witness whercof, I, the said Alexander Melville Clark, have
hereunto set my hand and seal, this Twenty-third day of Septem-
ber, in the year of our Lord One thousand eight hundred and
seventy-three.
Witness,
HENRY W. DEWEY,
53, Chancery Lane,
London.
A. M. CLARK. (L.S.)