AN IMPROVEMENT OR IMPROVEMENTS IN THE MANUFACTURE OF PRINTING INK
Year: 1857

page_text: LETTERS PATENT to Charles Fleet, of Brighton, in the County of
Sussex, for the Invention of "AN IMPROVEMENT OR IMPROVEMENTS IN THE
MANUFACTURE OF PRINTING INK."-A communication from George Matthews,
of Montreal, in Canada.
Sealed the 15th September 1857, and dated the 29th May 1857.
PROVISIONAL SPECIFICATION left by the said Charles Fleet at the
Office of the Commissioners of Patents, with his Petition, on the
29th May 1857.
I, CHARLES FLEET, of Brighton, in the County of Sussex, do hereby declare
the nature of the said Invention for "AN IMPROVEMENT OR IMPROVEMENTS IN
THE MANUFACTURE OF PRINTING INK," to be as follows:-
The material employed in the manufacture of the ink is the calcined green
oxide of chromium, which is mixed with oil or varnish or the other ordinary
ingredients of printing ink according as it is intended for the copper-plate,
lithographic, typographic, or other processes. This ink is unalterable by the
action of air, light, or sulphurous vapours, and is insoluble in nitric, muriatic,
or other acids, and caustic alkalies, and only soluble in boiling oil of vitriol.
From its power of resisting chemical agents, it is particularly well adapted for
printing bank notes and bills, and similar instruments and documents, as it
cannot be effaced without destroying the appearance of the note or other
document.

page_text: SPECIFICATION in pursuance of the conditions of the Letters Patent, filed
by the said Charles Fleet in the Great Seal Patent Office on the
25th November 1857.
TO ALL TO WHOM THESE PRESENTS SHALL COME, I, CHARLES
FLEET, of Brighton, in the County of Sussex, send greeting.
WHEREAS Her most Excellent Majesty Queen Victoria, by Her Letters
Patent, bearing date the Twenty-ninth day of May, in the year of our Lord
One thousand eight hundred and fifty-seven, in the twentieth year of Her
reign, did, for Herself, Her heirs and successors, give and grant unto me,
the said Charles Fleet, Her special licence that I, the said Charles Fleet,
my executors, administrators, and assigns, or such others as I, the said
Charles Fleet, 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 "AN IMPROVEMENT
OR IMPROVEMENTS IN THE MANUFACTURE OF PRINTING INK," communicated
to me by George Matthews, of Montreal, in Canada, upon the condition
(amongst others) that I, the said Charles Fleet, my executors or adminis-
trators, 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 Charles Fleet, do hereby declare
the nature of the said Invention, and in what manner the same is to be per-
formed, to be particularly described and ascertained in and by the following
statement thereof, that is to say:―
The material employed in the manufacture of the ink is the calcined green
oxide of chromium, which is mixed with oil or varnish or the other ordinary
ingredients of printing ink, according as it is intended for the copper-plate,
lithographic, typographic, or other processes. This ink is unalterable by the
action of air, light, or sulphurous vapours, and is insoluble in nitric, muriatic,.
and most other acids, and caustic alkalies, and only soluble in boiling or hot
oil of vitriol. From its power of resisting chemical agents, it is particularly
well adapted for printing bank notes and bills, and similar instruments and
documents, as it cannot be effaced without destroying the appearance of the
note or other document. The green oxide of chromium may be substituted

page_text: entirely for the lamp black or ivory black, or other pigments or colouring
matters used in the ordinary inks, or it may be employed together with such
colouring matters. The other ingredients are the same as those usually
employed in printing ink, and vary in nature and proportions according to the
purpose for which they are to be used, whether copper-plate, lithographic,
typographic, or other process or style of printing.
Having now described the nature of the said Invention, and in what manner
the same is to be performed, I wish it to be understood, that what I claim
is, the manufacture of printing ink with the green oxide of chromium as
herein-before described.
In witness whereof, I, the said Charles Fleet, have hereunto set my
hand and seal, this Twenty-fourth day of November, in the year of
our Lord One thousand eight hundred and fifty-seven.
5 Witness,
WILLIAM RANSOM,
4, Little East Street,
Brighton.
CHARLES FLEET. (L.S.)