A. Method of Decorating Metal Articles with other Metals Deposited thereon.
Year: 1891

page_text: Date of Application, 12th May, 1891-Accepted, 9th Apr., 1892
TODLI ----
A. Method of Decorating Metal Articles with other Metals
Deposited thereon.
We BERNARD KRANTZ and HERMANN ZEISSLER both of 13 Bunhill Row in
the City of London Lithographic Artists, do hereby declare the nature of the .
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 object of this invention is to decorate metal articles by the depositing of
other metals thereon, without the aid of a galvanic battery or dynamo-machine, in
such a manner as to form pictures or designs on the articles to be decorated.
According to this invention, we first coat the metal article with bitumen as in
zinc engraving and print the picture or design thereon direct from a photographic
negative, or transfer the picture or design in the ordinary way on to the bitumen
We then place
coating, which is then developed by turpentine in the usual way.
the article in an etching bath composed as follows:-Nitric acid, 2 parts by
measure, concentrated sulphuric acid 1 part by measure, pure water 3 parts by
measure. When sufficiently etched the article is taken out of the bath and well
washed in water, to remove all traces of acid and quickly dried in a warm place..
After this, it is placed in a depositing bath composed as follows:-For depositing
copper on other metals:-cream of tartar 12 parts, carbonate of copper 1 part,
water 24 parts, (by weight). This bath is heated to a temperature of about
75° Centigrade, till the evolution of gas ceases, after which some powdered whiting
is added, the whole allowed to stand till evolution of gas entirely ceases; the solution
is then filtered and the sediment remaining washed with 48 parts of water (by weight)
which, water is then added to the filtered solution and it is then allowed to cool.
On placing the article to be decorated in the above described depositing bath, pure
copper is immediately deposited all over the article except the design or picture,
which appears in the original metal on a copper ground, or by reversing the
process of transferring the picture, viz.-by printing from a positive instead of a
negative when placed in the depositing bath, the metal will be deposited on the
design only, leaving untouched the rest of the metal surface of the article to be
decorated. The bath for other metals is the same as above, with the exception of
the metal to be deposited. When gold is to be deposited, chloride of gold is
substituted for carbonate of copper. If silver, chloride of silver; if nickel, pure
nickel, or the usual electro plating solutions of metals. The decoration may be
either in positive or negative, if positive the light portions of the design will appear
in the metal of which the article is composed, and the shaded or dark portions of
the design in the metal plated on it; if negative, the lights would be in the plating
and the shading in the original metal. For example, if a portrait in silver is to be
produced in positive on copper, the face would be copper and the hair, eyes, and
dark shadows would be in silver; if in negative, the face and high lights would be
in silver and the hair, eyes and shading in copper. Instead of reproducing the
design on the article to be decorated by means of photography, we may cover the
article with a light coat of wax and draw the design thereon with a lithographic
carving pen or needle, the wax being scraped away with the needle till the surface
of the metal is exposed, the design is then etched in very lightly and the article
placed in the depositing bath as hereinbefore described.
Having now particularly described and ascertained the nature of the said inven-
tion and in what manner the same is to be performed, we declare that what we
claim is :-
•
(I) In the process of decorating metal articles by means of a different metal

page_text: (II) The improved process of decorating metal, substantially
described.
Dated the 12th day of May 1861
as herein
ERNEST SALAMÀN,
61 & 62, Chancery Lane, London, Agent for the Applicants.