Improvements in the Manufacture or Treatment of Paper for Bank-notes, Cheques, and the like.
Year: 1891

page_text: Date of Application, 4th Sept., 1891
Complete Specification Left, 7th June, 1892-Accepted, 9th July, 1592
PROVISIONAL SPECIFICATION.
Improvements in the Manufacture or Treatment of Paper for
Bank-notes, Cheques, and the like.
I, ALBERT SCHLUMBERGER, of Montreuil near Paris, in the Republic of
France, Manufacturer, do hereby declare the nature of this invention to be as
follows:-
The object of this invention is a process for producing paper used for bank
notes, cheques and similar papers of value in such a manner as to render forgery of
such papers impossible.
The process consists in so printing the paper completely equal on both sides as
to cause both prints to exactly coincide, so that when looking through the paper
against the light, only one print is apparently seen. Each of the two prints is
made in two or more colours arranged on one side in the reverse succession of the
colours on the other side so that the print appears in two or more colours when the
light falls on, but in one colour only, i.e. the composition colour when held against
the light.
The paper is guided through between two printing plates or printing rollers,
which produce on both sides of the paper perfectly equal copies so placed relatively
to each other that both copies when held against the light cover each other
precisely.
For printing the improved paper, various suitable colours may be advantageously
employed, for instance cobalt-blue, madder-carmine, a mixture of niadder and
cobalt or chrome-green.
These colours are so imprinted that they appear on one side of the paper in a
succession exactly opposed to that in which they are imprinted on the other side of
the paper, whereby the colours on both sides are converted towards each other
into the composition colour formed of both colours.
Papers thus imprinted are perfectly safe against imitations or forgeries, as not
only the printing itself, but also the manner of composing the colours requires
great exactness and practice in producing such papers.
Dated this 4th day of September 1891.
HUELSER & Co.,
Agents for Applicant.
COMPLETE SPECIFICATION.
Improvements in the Manufacture or Treatment of Paper for
Bank-notes, Cheques, and the like.
I, ALBERT SCHLUMBERGER, of Montreuil near Paris in the Republic of
France, Manufacturer, 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 :-
This invention has for its object, to produce or treat paper intended for bank-
notes, cheques and similar documents, in such a manner, as to render forgery of
such papers impossible.
The process consists in impressing the two sides of the paper exactly alike, so
that the two prints cover each other exactly, and that consequently, when looking
through the paper against the light, only one print is seen.
Each of the two prints
is made in two or more colours arranged on one side in the reverse succession of
the colours on the other side, so that the print appears in two or more colours,
P11

page_text: when the light falls on, (that is in reflected light), but in one colour only i.e. the
composition colour, when held against the light (that is in transmitted light).
In carrying out my process, the paper is guided through between two printing
plates or printing rollers, which produce perfectly equal impressions, so placed
relatively to each other, that when held against the light (that is, in transinitted
light) they cover each other precisely. For printing the improved paper various
colours may be advantageously employed, for instance cobalt blue, madder carmine,
a mixture of madder and cobalt, or chrome-green.
The order or succession in which the colours are arranged on one side (the
front) of the detective paper is the reverse to that on the other side (the back), so
that in transmitted light (when the observer and the source of light are on opposite
sides of the paper) different colours cover each other and the whole impression
appears to have the same colour (or mixture of colours employed).
For instance, if three colours are employed, namely, red, violet and bluc, so that
on the face of the paper, the red colour is near the right hand edge, the violet in
the centre and the blue near the left hand edge of the sheet, the back or reverse
side has the same pattern or design in the same colours, but the red is near the left
hand edge, the violet in the centre and the blue near the right hand edge of
the sheet. Consequently, the intermediate colour (violet) remains the same in
transmitted as in reflected light, and the extreme colours (blue and red) cover each
other, so that in transmitted light, they appear to be violet.
Instead of the colours just described, I may employ other combinations, such as
blue, blueish-green and green.
Paper produced in the manner described, is very difficult to imitate, because not
only the printing itself, but also the arrangement of colours requires great accuracy
and experience.
Having now particularly described and ascertained the nature of the said inven-
tion, and in what manner the same is to be performed, I declare that what I
claim is :-
1. The treatment of paper to render it suitable for banknotes, cheques, etc.,
which consists in producing on the two sides of the paper exactly equal impressions
(as regards design and size) which cover each other exactly, and the colours of
which are arranged in the reverse order, so that in transmitted light the impression
or print appears in the intermediate or composite colour, substantially as
described.
2. As a new article of manufacture, detective paper or blank paper for bank-
notes, cheques and similar documents, bearing on the two sides or faces coloured
impressions, which exactly cover each other, and of which the colours are arranged
in reverse order, substantially as described.
Dated this 7th day of June 1892.
HUELSER & Co.,
Agents for Applicant.