IMPROVEMENTS IN THE PREPARATION AND USE OF AN IMPROVED PRINTING OR SURFACING INK
Year: 1876

page_text: LETTERS PATENT to Robert Pinkney, of Bread Street Hill, in the City of
London, and Francis Davis Ward, of the Firm of Marcus Ward and Com-
pany, of Belfast, in the County of Antrim, Ireland, and of 67, Chandos Street,
in the County of Middlesex, for the Invention of "IMPROVEMENTS IN THE
PREPARATION AND USE OF AN IMPROVED PRINTING OR SURFACING INK."
Sealed the 8th May 1877, and dated the 18th November 1876.
PROVISIONAL SPECIFICATION left by the said Robert Pinkney and Francis
Davis Ward at the Office of the Commissioners of Patents on the 18th
November 1876.
ROBERT PINKNEY, of Bread Street Hill, in the City of London, and FRANCIS
DAVIS WARD, of the Firm of Marcus Ward and Company, of Belfast, in the County
of Antrim, Ireland, and of 67, Chandos Street, in the County of Middlesex.
"IM-
PROVEMENTS IN THE PREPARATION AND USE OF AN IMPROVED PRINTING OR SUR-
FACING INK."
This Invention relates to the production of an improved printing or surfacing
ink, and consists in the employment of soluble and non-deliquescent ferro or ferri
cyanides, such, for example, as the ferro or ferri cyanide of potassium, in conjunction
with aniline or with vegetable colors.
The object of this Invention is for the printing upon cheques or other papers, so
that when the same are written or marked upon with ordinary writing ink an
insoluble compound shall be formed; and in cases where an acid or acids are
employed for the purpose of discharging the writing or marks an insoluble com-
pound is produced, which cannot be discharged without destroying the surrounding
surface impression or design.
SPECIFICATION in pursuance of the conditions of the Letters Patent-filed by
the said Robert Pinkney and Francis Davis Ward in the Great Seal Patent
Office on the 17th May 1877.
ROBERT PINKNEY, of Bread Street Hill, in the City of London, and FRANCIS
DAVIS WARD, of the Firm of Marcus Ward and Company, of Belfast, in the County
Price 2d1

page_text: "IM-
of Antrim, Ireland, and of 67, Chandos Street, in the County of Middlesex.
PROVEMENTS IN THE PREPARATION AND USE OF AN IMPROVED PRINTING OR SUR-
FACING INK."
Our said Invention relates to the production, manufacture, and use of an improved
printing or surfacing ink, and it consists in the employment for such purposes of
ferro or of ferri cyanides in conjunction with coloring matters, such for example, as
aniline or vegetable coloring matters.
The object of this Invention being the preparation of or the printing upon
cheques or other papers, parchment, or vellum, so that when the same are written
or marked upon with ordinary writing ink a compound shall be formed; and in
cases where an acid or àcids are employed for the purpose of discharging or
obliterating the writing or marks a colored compound shall be produced, which
compound cannot be discharged without destroying the surrounding surface
impression or design.
În carrying out our said Invention we cause the paper to be printed upon by an
ink containing cither a solution of a soluble and non-deliquescent ferro or ferri
cyanide or with an ink containing an insoluble ferro or ferri cyanide.
As types of the ferro and ferri cyanides we prefer to employ, we give the ferro
and ferri cyanide of potassium as a soluble ferro or ferri cyanide and the ferro and
ferri cyanides of manganese as insoluble ferro and ferri cyanides.
Having now described and particularly ascertained the nature of our said Inven-
tion, and the manner in which the same is or may be used or carried into effect,
we would observe in conclusion that what we consider to be novel and original, and
therefore claim as the Invention secured to us by the herein-before in part recited
Letters Patent is, the production and use of an improved printing or surfacing ink
by the employment of ferro or ferri cyanides, substantially in the manner and for
the purposes herein-before described.
In witness whereof, I, the said Robert Pinkney, on behalf of Francis Davis Ward
and myself, have to this our Specification set my hand and seal, this Six-
teenth day of May, One thousand eight hundred and seventy-seven.