An Improved Process for Producing Colors on Glass Surfaces.
Year: 1892

page_text: Date of Application, 10th Sept., 1892-Accepted, 15th Oct., 1892
COMPLETE SPECIFICATION.
An Improved Process for Producing Colors on Glass Surfaces.
I, JOHANN CHRISTIAN DUNTZE of Tongesgasse 20, Frankfort o/M Germany,
Lithographer, 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:-
Notwithstanding numerous efforts no process has hitherto been discovered
enabling manufacturers to reproduce on glass, any design, in transparent colors, by
mechanical means, for although it was found possible to apply colors to glass, yet
these colors did not attain a sufficient transparency to form a perfect substitute for
stained glass.
The subject of the present invention is a process of reprinting, or transfer,
which will permit the accomplishment of the aforesaid end in an exceedingly simple
and easy manner.
The design to be reproduced is outlined on the lithographic stone, zinc-plate or
the like, in ordinary reprinting ink which is then transferred on to the well-known
transparent transfer-paper, viz., the socalled "albuminous paper."
Of course, cach individual color or tint must be reproduced separately, and
transferred upon the glass by means of separate pieces of transfer paper. The
surface of the glass, which may be either flat or round, having first been carefully
cleansed so as to remove any dust or grease, is now covered, first of all with the
transfer-paper bearing the deepest among the tints in question. The paper while
yet unmoistened is pressed against the surface of the glass with a soft brush or
similar tool until it is just commencing to adhere to the glass. Thereupon (and
not until then) the paper is moistened, and after that is once more rubbed all over
with the soft brush or tool. This process should terminate before the paper has
given off all the moisture imparted to it, so as to facilitate removal of the paper,
which is then pulled off. The transparent colors will be found to have meanwhile
adhered most intimately to the glass and when completely dry will be perfectly
transparent. In exactly the same way all the other tints of the design are trans-
ferred upon the glass, so that any desired pattern may be printed on glass panes,
bottles, tumblers or cups, etc. For better preservation, the colored design may be
coated with a colorless transparent varnish, or the colored surface may be backed
with au opaque coating, in accordance with the style of pattern desired.
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 :-
A process for the production of colored impressions (chromo-printing) on glass,
its characteristic feature being the transfer of reprinting" or transfer colors upon
a transparent transfer-paper; which paper before being moistened is pressed against
the surface of the glass by rubbing until the colors begin to adhere, it is then
moistened and further rubbed, this process being discontinued before all the moisture
has quite disappeared from the paper, whereupon the paper is taken off, and the
next color, if any, is proceeded with in the same mauner.
Dated this 10th day of September 1892.
J. E. EVANS-JACKSON & Co.,
Agents for the Applicant.