Improvements in the Manufacture of Paper for Cheques and like Documents.
Year: 1891

page_text: Date of Application, 15th Jan., 1891
Complete Specification Left, 13th Oct., 1891-Accepted, 14th Nov.,
1891
PROVISIONAL SPECIFICATION.
Improvements in the Manufacture of Paper for Cheques and like
Documents.
We ROBERT CHARLES MENZIES of Inveresk Mills, Musselburgh, in the
County of Edinburgh, Paper Maker, and EDWARD JOHN BEVAN of 4 New Court,
Lincoln's Inn, London, in the County of Middlesex, Chemist do hereby declare
the nature of this invention to be as follows:-
The object is to produce for cheques, monetary and other valuable documents,
paper which will disclose with certainty any falsification or alteration of any written
or printed matter thereon, when acids, bleaching fluids, alkalies or other chemicals
are used to remove any portion of the written or printed matter.
For the above purpose we incorporate with the paper pulp, ferrocyanide of
manganese and starch, and add iodide and iodate of potash and sulphate of
manganese to the finished or partly finished paper by passing the said paper
through a solution of the added agents.
Per pro J. T. KING,
J. Johnson,
Agent.
COMPLETE SPECIFICATION.
Improvements in the Manufacture of Paper for Cheques and like
Documents.
We ROBERT CHARLES MENZIES of Inveresk Mills, Musselburgh in the County
of Edinburgh, Paper Maker, and EDWARD JOHN BEVAN of 4 New Court,
Lincoln's Inn, London, in the County of Middlesex Chemist do hereby declare the
nature of this invention and in what manner the same is to be performed, to be
particularly described and ascertained in and by the following statement :-
The object is to produce for cheques, monetary, and other valuable documents,
paper which will disclose with certainty any falsification or alteration of any
written or printed matter thercon when acids, bleaching fluids, alkalies or other
chemicals are used to remove any portion of the written or printed matter.
For the above purpose we incorporate with the paper pulp, ferro-cyanide of
manganese and starch, and add iodide and iodate of potash and sulphate of
manganese to the finished or partly finished paper by passing the said paper
through a solution of the added agents.
The ferrocyanide of manganese and the starch should be each about one per cent.
of the pulp in weight and are by preference added in the beater. The solution
through which the finished paper is passed contains to each gallon of water about
the following proportions of soluble salts one ounce of potassium iodide, one ounce
of potassium iodate and five ounces of sulphate of manganese.
We find that good
results are obtained when the solution is kept at a temperature of about 80° F. and
the paper is in contact with the solution for about 3 seconds. The sulphate of
manganese may be reduced in amount if the quantity of ferrocyanide of manganese
is increased, and with sufficient ferrocyanide say about 2 per cent. may be dispensed
with altogether.

page_text: Having now particularly described and ascertained the nature of our said inven-
tion, and in what manner the same is to be performed, we declare that what
we claim is :-
First. Paper containing ferrocyanide of manganese, starch, and iodide and iodate
of potassium with or without the addition of sulphate of manganese.
Second. Adding ferrocyanide of manganese, starch, and iodide and iodate of
potash to paper substantially as and for the purpose set forth.
Dated the 19th day of October 1901
°
Per pro J. T. KING,
J. Johnson,
Agent.
Per pro J. T. KING,
J. Johnson,
Agent.