Improvements in Producing Inscriptions, Designs, or other Matter for Various Purposes upon Marble or other Stone, Real or Artificial, or upon other Adaptable Materials with Special Reference to Advertising.
Year: 1897

page_text: Date of Application, 13th Nov., 1897-Accepted, 22nd Jan.,
1898
COMPLETE SPECIFICATION.
Improvements in Producing Inscriptions, Designs, or other Matter
for Various Purposes upon Marble or other Stone, Real or
Artificial, or upon other Adaptable Materials with Special
Reference to Advertising.
We, JULES EMANUEL DE POIL, of 15, Richmond Street, in the City and County
of Newcastle-on-Tyne, Engraver, and THE NORTH EASTERN PRINTING AND
PUBLISHING. COMPANY, LIMITED, of 4, Elswick Court, in the City and County of
Newcastle-upon-Tyne, Printers and Publishers, do hereby declare the nature of
said invention and in what manner the same is to be performed, to be particularly
described and ascertained in and by the following statement:-
The invention relates to an etching or chemical engraving process by which
inscriptions, designs or the like may be produced, sunk or in relief, upon the
surface of marble or other stone, real or artificial, or upon other material or sub-
stances adapted to the process, forming slabs for the tops of tables, counters or on
tablets or panels, plain or to be afterwards embellished in various colours and has
special reference to advertising purposes.
The chemical solutions used in the process are three and consist of the
following:-
Solution No. 1.-1,000 grammes of Benzol and 90 grammes Bitumen mixed
together.
Solution No. 2.-30 grammes essence of Lavender and 15 grammes Camphor
mixed together.
Solution No. 3.-One gramme Chloride of Gold mixed in ordinary spirit of tur-
pentine (quantity 2 ounces). These solutions Nos. 1, 2 and 3 are to be well mixed
and shaken together for half an hour, then allowed to stand 24 hours and to be
afterwards filtered through cotton wool or glass wool. The surface of the marble
tops having been thoroughly cleaned and allowed to stand on their end to drain.
no movement being made after the tops are once placed in this position. In one
half-hour's time, after the solution is perfectly dry upon the marble, take the
drawing or design (which must be on tissue or similar paper) and place it firmly
upon the marble, then place the marble and the design in a printing frame and,
when firmly secured, expose the glass side to the electric light of about 2000
candle power, for one hour and a quarter.
After the drawing and marble have been exposed for this time remove them from
the frame and take the marble slab (after removing the drawing) and place the
slab into a bath containing developing solution composed of spirits of turpentine,
rectified, leave the slab in this solution for five minutes then the design will appear
on the marble equal to the original drawing except that the parts black on the
design will appear white and sunk on the marble.
After this developing process the marble slab is to be well washed in water,
dried to enable any necessary retouching to be done by means of using the first
solution mixed together and used with a brush.

page_text: Etching Process. The acid solution is a composition of one part Muriatic Acid,
one part of Perchloride of Iron, one part of Nitric Acid and one pound of Gum
Arabic, and 6 parts of pure water, place in a bath, place the marble slab in same for
8 minutes, or until the design or matter is sufficiently deep in the marble, to take
it out of the bath and wash with benzine. The back of the marble slab to be pro-
tected in the bath with a solution of shellac and methylated spirits.
Composition for Filling In. Sealing wax of desired colours best quality, to be
dissolved in Alcohol and use with a brush to fill in.
Having now particularly described and ascertained the nature of said inven-
tion and in what manner the same is to be performed we declare that what we
claim is:-
The production of inscriptions, designs or other matter, sunk or in relief, upon
marble or other stone, real or artificial, or upon other adaptable materials, by the
chemical solutions, apparatus and processes substantially as hereinbefore described.
Dated thin 19th dom of N 1007
T. J. DANSON,
Agent for Applicants, Newcastle-upon-Tyne,