IMPROVEMENTS IN CHROMO-LITHOGRAPHIC PICTURES AND IN METHODS OF PRODUCING THE SAME AND OTHER CHROMO- LITHOGRAPHIC PRINTS
Year: 1882

page_text: PROVISIONAL SPECIFICATION left by Henry Harris Lake at the Office of
the Commissioners of Patents on the 1st February 1882. A communication
from abroad by S. Czeiger of Vienna, Austria.
HENRY HARRIS LAKE of the Firm of Haseltine Lake and Co. Patent Agents
Southampton Buildings London. "IMPROVEMENTS IN CHROMO-LITHOGRAPHIC
PICTURES AND IN METHODS OF PRODUCING THE SAME AND OTHER CHROMO-
LITHOGRAPHIC PRINTS." [A communication from abroad by S. Czeiger of Vienna,
Austria.]
This Invention relates to improvements in chromo-lithography and in the
production thereby of imitations of oil paintings and water colors known as
chromos, oleographs and the like. According to the method hitherto employed
each stone is prepared by making drawings upon it with chalk or with a pen
which are then etched by a well known process.
By my Invention a great part of the manual labor is done away with as I use
for the preparation of the stones a transfer paper upon which are printed a series
of equidistant parallel lines which are transferred to certain parts of each stone as
hereinafter described.
As in the method hitherto employed a separate stone is used for every color that
has to be printed, and on each stone are impressed the outlines of the design to be
produced. Those parts of cach stone which are not needed in the printing are
then covered with a coating consisting of a mixture of vermillion with dissolved
gum arabic (about five (5) parts vermillion to ninety five (95) parts gum solution)
and on to the stone thus prepared are transferred the lines printed upon the
transfer paper. The stone upon which the lines only take effect at those parts
which were not covered with the aforesaid coating, is then washed clean with
water and there only remains on the said parts a series of parallel lines suitable for
producing the lighter shades of coloring.
At those parts on the said series of parallel lines where more color is required
that is to say where it is desired to obtain a darker shade after the stone has again
been prepared with the same gum solution other parallel lines are printed but in
such a way that a simple intercrossing of the lines is obtained.
Drinn 211

page_text: Again on those particular parts of the simple intercrossing where it is desired to
get a still darker shade the lines are again impressed in a similar manner whereby
a double intercrossing is obtained.
If desired by means of further impression of the lines upon particular parts of
the double intercrossing a threefold intercrossing and so on may be obtained.
By further intercrossing of the lines all the modulations of shades of color which
are to be printed with the particular stone can thus be produced.
After the stone has been thus prepared it is etched with a somewhat stronger
etching solution than has hitherto been used for the purpose and the stone is thus
made ready for printing. It must not however be etched until all the lines and
intercrossings are impressed upon it which are necessary for the production of the
- different shades of color which are to be printed with that slone,
Instead of parallel lines being printed upon the transfer paper it may be
provided with lines which cross each other once or several times and if desired, lines
may be used which instead of intercrossing lio closer to one another so as to
produce by the impression the different shades required.