Improvements relating to the Ornamentation of Porcelain, Glass, and the like.
Year: 1894

page_text: Date of Application, 3rd Aug., 1894-Accepted, 8th Sept., 1894
COMPLETE SIECIFICATION.
Improvements relating to the Ornamentation of Porcelain, Glass,
and the like.
I, WILHELM GRÜNE Senior, of 130 Alte Jacobstrasse, Berlin, S.W., in the
Empire of Germany, Chemist, 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 the ornamentation of porcelain, glass and the like.
Ornamentations on porcelain, glass, faience and the like have heretofore been
produced by transferring the drawings with gold-glaze, platinum-glaze, metal-lustre
or the like and then burning them in. This method possesses the disadvantage
that fine drawings and impressions cannot be reproduced by the same.
According to my improved method the surfaces to be decorated with drawings,
ornamental writing or the like are first completely coated with the solution of
gold-glaze, platinum-glaze or the like, and this coating is then burned in. The
ornamentations upon the surface thus coloured are covered with a material which
resists the action of acid. Such a material may suitably consist of a mixture of
linseed-oil varnish, asphalt and mastic. This material may be printed on for
instance with elastic forms, stamps or plates on which the ornamentations are
provided in relief. Then the impression or coating is dried in the open air or by
heat. In this manner the ornamental lines are covered with a material which
resists the action of acid, and the uncovered gold, platinum or the like is etched
away by aqua regia or other suitable acids. After this operation the etched
surface is washed and the etched ground printed on or otherwise applied is finally
removed by means of turpentine, petroleum, or the like, whereupon the
ornamentation appears bright and clear.
In lieu of a liquid corrodent or etching agent use may also be made of an
etching paste or pulp which is applied by a spatula or brush to the place to be
etched. In this manner I obviate the inconveniences which are otherwise
experienced when using acid. Such an etching pulp may be prepared by pouring
aqua regia upon levigated infusorial earth.
By means of my improved method I can reproduce the finest ornamental lines.
Having now particularly described and ascertained the nature of my said inven-
tion and in what manner the same is to be performed, I declare that what I
claim is :-
First. A method of ornamenting porcelain, glass and the like with metal-glaze
colours, by producing with the aid of the colour a uniform coating upon the
surface to be ornamented and burning it in, whereupon the places to be ornamented
are provided with a coating capable of resisting acid, in order to enable the
remaining places of the coating to be then etched away.
Second. In the method set forth in the first claim the employment of an etching
pulp which is prepared by mixing dry infusorial carth with an acid.
Deted this 3rd day of August 1894.
HASELTINE, LAKE & Co.,
45, Southampton Buildings, London, W.C., Agents for the Applicant.