A NEW OR IMPROVED PROCESS OF PREPARING PAPER OR SIMILAR MATERIALS TO RENDER INDELIBLE WRITINGS OR OTHER MARKINGS THEREON
Year: 1885

page_text: I, DAVID CUMMING SIMPSON of 26 Montrose Terrace, Regent Road, in the City
of Edinburgh, Engraver and Printer, do hereby declare the nature of my Invention
for "A NEW OR IMPROVED PROCESS OF PREPARING PAPER OR SIMILAR MATERIALS
TO RENDER INDELIBLE WRITINGS OR OTHER MARKINGS THEREON," to be as
follows:-
My Invention relates to a new or improved process of preparing paper or other
materials to render indelible writings or other markings thereon.
This process consists of impregnating paper, cardboard, wood, or other material
on which writing or printing may be done, with a chemical or chemicals, whereby
the ink or other writing, printing or marking material becomes indelible in water,
thereby enabling said material to be exposed to wet or damp without being
materially affected thereby.
The chemicals which I employ may consist of an alkali or alkalies, or of metallic
or alkaline carbonates, oxides, bases, or any soluble salt having the desired effect.
These may be either applied to the surfaces of, or embodied in, the material used
for writing, printing or marking upon.

page_text: Materials to Render indelible writings or other markings
thereon.
I, DAVID CUMMING SIMPSON, of 26 Montrose Terrace, Regent Road, in the city
of Edinburgh, Engraver and Printer, 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 :—
My invention relates to a new or improved process of preparing paper or other
materials to render indelible writings or other markings thereon.
This process consists of impregnating paper, cardboard, wood or other material
in which writing or printing may be done with a chemical or chemicals, whereby
the ink or other writing, printing, or marking material becomes indelible in water,
thus enabling said material to be exposed to wet or damp without being materially
affected thereby ; being particularly adapted for the manufacture of paper, for
address labels, and other such like purposes.
And in order that the nature and mode of performing or carrying my said
invention into effect or practice may be properly understood, I shall now proceed
to describe the same in and by the following statement in writing.
The chemicals which I employ consist of an alkali or alkalies, preferably soda or
Potash, or of metallic or alkaline, carbonates, but preferably Sodium, carbonate or
bicarbonate, or oxides, Cyanides bases, or any soluble salt having the desired effect.
These would be applied in the form of solution to the surfaces of the material used
for writing, printing or marking upon, or embodied in the material during the
process of its manufacture.
In carrying out my Invention I find that coating the paper or material with, or
immersing it in a solution of Sodium Carbonate or Bicarbonate, or the corre-
sponding Potassium salts or Potassium Ferrocyanide, either with or without the
addition of a mordant such as Alum, or Tin chloride, or with either of these
mordanta alone, answers well as a writing, marking or printing surface, rendering
ordinary writing and stencilling inks or marking material containing iron or other
metallic salts insoluble or indeliable in water; and the solutions so used are pre-
ferably of a moderate strength, being neither very weak nor yet too concentrated.
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
In the manufacture or preparation of paper or similar material, the use of
chemical salts for the fixing of writing or marking inks, substantially as and for
the purposes herein set forth.
Dated oth
Doomhon TOOK