A Process of Preparing Metallic Printing Plates.
Year: 1885

page_text: [Communicated from abroad by Wirth and Company, acting as Agents for
Cesur Felix Josz, of N° 2. Auf dem Kies, Bockenheim, near Frankfort on the
Main, in the German Empire, Engineer.]
A Process of Preparing Metallic Printing Plates.
I, ERNEST DE PASS, of 68 Fleet Street, in the City of London, Fellow of the
Institute of Patent Agents, do hereby declare the nature of said Invention for
A PROCESS OF PREPARING METALLIC PRINTING PLATES. Communicated to ine
from abroad by Wirth and Company,, acting as agents for Cesar Felix Josz, of
No 2 auf dem Kies, Bockenheim, near Frankfort on the Main, in the German
Empire, Engineer, to be as follows:-
According to this invention the metallic plates, of every kind, when about to be
used should have their surfaces as chemically clean as possible.
They are then grained by mechanical means, the grained metallic plates are then,
for the purpose of scouring, placed for a short time in a saturated solution of
alkaline earth, chalk being excepted, the best solution being magnesia in water,
they are then taken out rubbed and dried.
Then, in order, by means of an astringent, to open the grained surface, previously
produced by mechanical means, the metallic plates are sprinkled with a watery
Eolution which operates only mechanically, the preferred solution being:
100 parts water,
10 parts alabaster powder, and
5 parts alum,
after which the metallic plates are dried.
Then the layer or coating, when dried, is washed off from the plate with alcohol.

page_text: A Process of Preparing Metallic Printing Plates.
I, ERNEST DE PASS, of 68 Fleet Street, in the City of London, Fellow of the
Institute of Patent Agents, do hereby declare the nature of said invention for
A PROCESS OF PREPARING METALLIC PRINTING PLATES. Communicated to me
from abroad by Wirth and Company, acting as agents for Cesar Felix Josz, of
No 2 Auf dem Kies, Bockenheim, near Frankfort on the Main, in the German
Empire, Engineer, and in what manner the same is to be performed, to be
particularly described and ascertained in and by the following statement:―
According to this invention the metallic plates of every kind, when about to be
used, should have their surfaces as chemically clean as possible.
They are then grained by mechanical means, the grained metallic plates are then,
for the purpose of scouring, placed for a short time in a saturated solution of
alkaline earth, chalk being excepted; the best solution being inagnesia in water;
they are then taken out, rubbed and dried.
Then, in order, by means of an astringent, to open the grained surface, previously
produced by mechanical means, the metallic plates are sprinkled with a watery
solution which operates only mechanically, the preferred solution being:
100 parts water,
10 parts alabaster powder, and
parts alum,
after which the metallic plates are dried.
Then the layer or coating when dried is washed off from the plate with alcohol.
The plate is then ready for pen and chalk, and for transfer.
.Having now particularly described and ascertained the nature of the said
invention, and in what manner the same is to be performed, I declare that what
I claim, as communicated to me by my foreign correspondent, is
The herein described method of preparing metallic printing plates of possibly
pure metal, and which, in every way, replaces lithographic stones, consisting of any
kind of metal plates, with a surface mechanically grained & all grease extracted by
a solution of alkaline earth, and freed from any oxide, and lastly, having their
grain raised or opened by means of astringents, giving to the prepared metallic
surface the permanent affinity for printing purposes.
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