IMPROVEMENTS IN THE PREPARATION OF SAFETY PAPER AFFORDING PROTECTION AGAINST ERASURES OR OTHER ALTERATIONS
Year: 1884

page_text: PROVISIONAL SPECIFICATION,
I, JOHN JAMESON of Akenside Hill, in the City and County of Newcastle-on-
Tyne Consulting Engineer, do hereby declare the nature of my invention for
IMPROVEMENTS IN THE PREPARATION OF SAFETY PAPER AFFORDING PROTECTION
AGAINST ERASURES OR OTHER ALTERATIONS, to be as follows:―
My invention has for its object the production of a safety paper which shall
indicate chemical or mechanical erasure or alteration by change in appearance. I
form upon the paper to be protected a more or less intricate and minute design
easily discoverable by reflected light by reason of its possessing a surface either
more or less highly glazed than the other parts of the paper and of such a character
that if the paper be wetted the difference of surface will be more or less diminished
or lost and I use this method of protection either by itself or in combination with
any other or more than one other protecting arrangement, such as delible color
printing soluble films or the use of chemicals, or delicate tints in the paper, or
others.
I produce the design on paper suitable for the purpose by pressure from plates or
rollers so as slightly to emboss the surface or by extra sizing in the form of a design
or by the printing of a soluble film possessing a glaze of its own or by any other
convenient means I may glaze in the first instance the whole surface of the paper
and produce the design in relief by a damp printing or other means by which at
certain parts the glaze shall be reduced.

page_text: DE BUIFICATION,
I JOHN JAMESON of Akensidė Hill, in the City and County of Newcastle-on-
Tyne Consulting Engineer, do hereby declare the nature of my invention for
IMPROVEMENTS IN THE PREPARATION OF SAFETY PAPER AFFORDING PROTECTION
AGAINST ERASURES OR OTHER ALTERATIONS, and in what manner the same is to
be performed, to be particularly described and ascertained in and by the following
statement:-
JQ 0
My invention has for its object the production of a safety paper which shall
indicate chemical or mechanical erasure or alteration by change in appearance. I
form upon the paper to be protected a more or less intricate and minute design
easily discoverable by reflected light by reason of its possessing, a surface either
more or less highly glazed than the other part of the paper and of such a character
that if the paper be wetted this difference of surface will be more or less diminished
or lost and I use this method of protection either by itself or in combination with
any other, or more than one other protecting arrangement such as 'delible color
printing, soluble films or the use of chemicals or delicate tints in the paper or
others.
I produce the design on paper suitable for the purpose by pressure from plates or
rollers so as, slightly to emboss the surface, or by extra sizing the form of a design
or by, the printing of a soluble-film possessing a glaze of its own or by any other
convenient means, I may glaze in the first instance the whole surface of the páper
and produce the design in relief by a damp printing or other means by which at
certain parts the glaze shall be reduced.
Having thus described the nature of my Invention I will proceed more
particularly to describe the manner in which the same may be carried out.—A
simple means whereby my protection may be applied to paper is the following.
I take a paper possessing a certain uniform amount of glaze over the whole
surface and by pressure from an engraved or embossed roller or by plates bearing a
design in relief I simply impart additional glaze to certain parts of the paper or for
mere distinct effect I may use such an arrangement as a series of very thin stencil
plates of steel or a continuous band of steel cut out like a very thin stencil plate
and behind it a layer of felt or a second sheet of paper with felt behind it, and pass
the whole through rolls or a press so as that while the parts, opposed to the surface
of the steel plate acquire increased glaze the parts uncovered by the steel plates
acquire diminished glaze gradually shading off towards the more glazed parts, which
'diminished glaze is due to the contact of the two papers.
I may otherwise arrange to print upon lightly sized paper a design in size and
when the whole is then glazed in the usual way the more highly sized portions of
the paper will be found to possess a glaze of a different character from the portion
less highly sized.
I may also in combination with this protection use different compositions for
sizing the different parts of the paper, for the printed sizing a mixture of size with
other materials such as gum or dextrine, and for the first sizing of the whole paper

page_text: ordinary size, I may also use with the printed sizing any convenient soluble
chemical such as iodide of Potassium which would give a distinctly visible reaction
with another chemical such as Bichloride of Mercury as a means to ascertain
whether the paper has been subjected to sponging or if chance dampness only may
cause it to have a suspicious appearance.
"
For the preparation of paper by the printing of a soluble film having a glaze of
its own I may use gum or solution of albumen such as is used for photographs.
Or I may so glaze a paper all over as that the application of moisture will reduce
the glaze, and then print from wooden blocks or from felt, lace or tarlatan a merely
damp printing which diminishes the glaze. And I may with the damp printing
introduce a soluble chemical as before described, as a means whereby to discover
whether the paper has been sponged or washed. Any or more than one of these
protections may of course be used in combination with any other convenient pro-
tection according to the degree of security which it is desired to give to the paper,
but my invention I consider applicable by itself as a protection for such paper as
Lawyers
is used for what I think will be readily understood by the term
documents," also for Commercial Books, for Bills of Exchange drawn on imprinted
paper, and generally for such papers as may not be conveniently protected by other
means. My invention is also applicable to the protection of parchment mutatis
mutandis. I prefer to produce the difference of surface in the form of a minute
design and that this design should be uniform for all paper protected in this way.-
I especially intend the protection as a simple means of guarding against danger
arising from the use of inks containing no mordant, such as China Ink, or what is
called "school room ink," which may be sponged off paper by the application of
water only. If the glaze of the paper be uniform all over, a close imitation of the
original glaze may be given with a warm flat iron but when the glaze exists in 'the
form of a design this cannot be easily imitated.
Having now particularly described and ascertained the nature of my said
invention and in what manner the same is to be performed I declare that what
claim is
The preparation of safety paper substantially as described, with different surfaces,
the difference of surface being of such a character as that if the paper be wetted,
or if the writing be erased the absence of adequate difference of surface will
indicate that this has occurred.