Protection against Erasure or other Alteration.
Year: 1885

page_text: Protection against Erasure or other Alteration.
I JOHN JAMESON of Akenside Hill, in the City of Newcastle-upon-Tyne,
Consulting Engineer, do hereby declare the nature of my invention for IMPROVE-
MENTS IN THE PREPARATION OF SAFETY PAPER AFFORDING PROTECTION AGAINST
ERASURE OR OTHER ALTERATION, to be as follows:-
The object of my invention is to prepare a protected paper which shall place
difficulties in the way of and afford facility for the detection of alteration or
erasure. I use my invention by itself or in combination with one or more other
protections according to the purpose for which the paper may be required.
I attach to the paper to be protected a color highly soluble in water or fluids
containing water I attach this color preferably but not necessarily in the form of
fine dry powder which I apply preferably before the final glazing of the paper to be
protected, so as that it shall be so involved in the interstices of the paper by the
glazing process as to be not easily removable; and in combination with this protec-
tion I employ in like manner preferably in the form of a fine dry powder (or if a
color insoluble in water be used it may be mixed with the paper stuff in the paper
mill) a color or colors highly soluble in spirit (by which I mean also ether, chloro-
form, and other such chemicals) so as that if any attempt be made to wash or film
the paper whether with water or spirit a stain or series of stains shall be produced
by the solution of the soluble colors.-The powders might be attached by dusting
on to a lightly printed design while still slightly damp and sticky, but. I wish to
involve the colors amongst the actual fibre of the paper and prefer to employ it
over the whole surface or partly on the surface and partly in the body of the paper
before glazing or in accordance with my patent N° 11,087 of 9th August 1884
(wherein the glazing of the paper varies in different parts) I would attach with
different degrees of adhesion the colouring matter to different parts of the paper.
If the paper be unprotected by printed design the quantity of color may be so
small as to be invisible to the naked eye unless or until the paper be wetted with
water or spirit.

page_text: Protection against Erasure or other Alteration.
I, JOHN JAMESON of Akenside Hill, in the City of Newcastle-upon-Tyne,
Consulting Engineer, do hereby declare the nature of my invention for IMPROVE-
MENTS IN THE PREPARATION OF SAFETY PAPER AFFORDING PROTECTION AGAINST
ERASURE OR OTHER ALTERATION, and in what manner the same is to be per-
formed, to be particularly described and ascertained in and by the following
statement:
The object of my Invention is to prepare a protected paper which shall place
difficulties in the way of and afford facility for the detection of alteration or
erasure. I use my invention by itself or in combination with one or more other
protections according to the purpose for which the paper may be required.
I attach to the paper to be protected a color highly soluble in water or fluids
containing water, I attach this color preferably but not necessarily in the form of
fine dry powder which I apply preferably before the final glazing of the paper to
be protected so as that it shall be so involved in the interstices of-the paper by the
glazing process as to be not easily removable; and in combination with this protec-
tion I employ in like manner preferably in the form of a fine dry powder (or if a
color insoluble in water be used it may be mixed with the paper stuff in the paper
mill) a color or colors highly soluble in spirit (by which I mean also ether, chloro-
form, and other such chemicals) so as that if any attempt be made to wash or film
the paper whether with water or spirit a stain or series of stains shall be produced
by the solution of the soluble colors. The powders might be attached by dusting
on to a lightly printed design while still slightly damp and sticky, but I wish to
involve the colors amongst the actual fibre of the paper and prefer to employ it
over the whole surface, or partly on the surface and partly in the body of the
paper, before glazing or in accordance with my patent No 11,087 of 9th August 1884
(wherein the glazing of the paper varies in different parts) I would attach with
different degrees of adhesion the coloring matter to different parts of the paper.―
If the paper be unprotected by printed design the quantity of color may be so
small as to be invisible to the naked eye unless or until the paper be wetted with
water or spirit.
In carrying out my invention if the coloring matter be applied in fine powder
to unglazed paper I take the sheets of paper after they are sized and dried, but
before they are glazed and dust over them by hand or by any convenient mechanical
arrangement, a very fine powder of analine color, highly soluble in water and
another similar powder of analine color highly soluble in spirit separately or mixed
together, or I may select one of these colors which is soluble in both water and
spirit. I prefer the analine colors because they shew little color in the dry state,
compared with the dense color produced by their solution, but other colors of any
convenient kind may be used. I then brush off by hand or by any convenient
mechanical device so much of the powder as is very easily removed leaving such
part as is involved in the interstices due to the roughness of the paper.--I then,
with this powder adherent, glaze the paper by the usual process of pressing and by

page_text: that means lock up within the body of the paper the color which was most deeply
involved in the minute receivers existing in its previous condition of roughness.-
I prefer then to subject the paper to a second brushing to remove any traces of
coloring matter which are unattached or but very slightly attached to the paper.-
If paper so prepared be wetted with either water or spirit for the purpose of
erasure or alteration, the contained coloring matter will be dissolved and a stain
will be made in the paper sufficient to indicate that it has been wetted. The colors
may be applied to glazed paper and pressed or brushed in and then what is super-
fluous or what cannot be made to enter into the pores of the paper may be brushed
off, but I prefer to apply the color or colors (when they are applied dry) to the
paper before its final glazing and in the manner first described.
As an alternative arrangement I may apply the color intended to give a stain on
the application of spirit by mixing in the pulp of which the paper is to be made,
coloring matter insoluble in water but soluble in spirit, such as alkanet root and
then applying the color intended to produce stains with water, as a dry powder as
already described. Or I might in conjunction with the process described in my
patent No 11,087 apply coloring matter in the manner already described over
paper which possesses the differential glaze described in that patent; the effect of
which would be that more. color would adhere in the less glazed than on the highly
glazed parts of the paper, and thus I should obtain if the paper was wetted what
might be described as a differential stain.-A protection such as I have described
as my Invention against the use of water only or spirit only may be applied, but
I prefer in every case to use such coloring matters as are soluble in both, and
efficient for making the desired stain with either water or spirit.
My invention may be used alone or in combination with any other protections
provided they be of such kind as not to interfere with the effects produced by the
arrangement now described as my invention.
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
I claim is
The production of safety paper substantially as described containing soluble
coloring matter which shall produce a stain if the paper be wetted by water or
spirit.
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