Year: 1886

page_text: I, CHARLES FRÉDÉRIC ROUSSET of 1 Boulevard St Denis, Paris, France,
Mechanical Engineer do hereby declare the nature of this invention to be as
follows:-
:-
My invention consists first of a new fluid siocative varnish for replacing ink
transferred to stone or zino; and secondly of a method of applying this varnish.
The new varnish is composed of :-
Heavy Benzine
-
760 to 860 grammes.
Judea Bitumen (Mineral pitch) 90 to 120 grammes,
Essence of Copaiva
7 to 20 drops.
the proportions varying according to the particular work to be executed.
The benzine and bitumen are mixed together and while they are still being
stirred the drops of essence of copaiva are added. The varnish thus made is placed
in glass vessels of a color that will prevent the influence of light.
The addition of the copaiva is not essential, its only object being to make the
varnish more perfect.
For the purpose of applying this varnish in order to solidify, preserve the
fineness of, and fix with more rapidity lithographic or other transfers on stone and
sinc the following method or series of operations is adopted.
1. After the transfer, gum with a light gum, wipe with a soft cloth, and stop
with care in order to fill up the lines and remove any marks that may remain on
the design. The coating should be thin; a light pellicle is sufficient.
2. Dry completely.
3. After being assured that there is no more dampness about the stone, remove
with spirit with the aid of another dry soft cloth; then dry completely.
4. Pour varnish onto the stone according to the size of the transfer, spread
it over the design with another soft cloth as rapidly and regularly as possible.
Two or three trials will be sufficient to enable a person to do this promptly. The
Price 641

page_text: varnish although very fluid dries at once as it is very siccative; two minutes will
suffice but it may be left on the stone for an indefinite period without prejudice.
5. Finally, wash the stone as if it were in the black. The varnish only rests on
the design and forms a hard and attractive body which will allow of a slight
acidulation if it is desired to obtain a design finer than the original. It is however
better to ink it. This inking can be done with the greatest simplicity just as if a
transfer already prepared were inked.
If defects or weak points show themselves they are corrected as follows:-
They are resined and inked once or oftener until they are of the desired tone;
then the operation already explained is commenced, that is to say, the gumming,
removing with spirit, and application of the varnish.

page_text: I CHARLES FRÉDÉRIC ROUSSET, of 1 Boulevard St Denis, Paris, France,
Mechanical Engineer 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 consists first of a new fluid siccative varnish for fixing lithographic
typographic, or autographic transfers on stone or zinc; and secondly of a method
of applying this varnish.
The new varnish is composed of :-
Heavy Benzine
760 to 860 grammes.
Judea Bitumen (Mineral pitch) 90 to 120 grammes.
Essence of Copaiva
7 to 20 drops.
the proportions varying according to the particular work to be executed.
The benzine and bitumen are mixed together, and while they are still being
stirred the drops of essence of copaiva are added. The varnish thus made is placed
in glass vessels of a color that will prevent the influence of light.
The addition of the copaiva is not essenial, its only object being to make the
varnish more perfect.
For the purpose of applying this varnish, in order to solidify, preserve the
fineness of, and fix with more rapidity lithographic or other transfers on stone or
on zinc the following method or series of operations is adopted :-
1. After the transfer, gum with a thin gum, wipe with a soft cloth, and stop
with care in order to fill up the lines and remove any marks that may remain on
the design. The coating should be thin; a light pellicle is sufficient.
2. Dry completely.
3. After being assured that there is no more dampness about the stone, remove
with spirit with the aid of another dry soft cloth; then dry completely.
4. Pour varnish on to the stone, according to the size of the transfer and spread
it over the design with another soft cloth as rapidly and regularly as possible.
Two or three trials will be sufficient to enable a person to do this promptly and
readily. The varnish although very fluid dries at once as it is very siccative; two
minutes will suffice but it may be left on the stone for an indefinite period without
prejudice.
5. Finally wash the stone as if it were in the black or "rolled up". Only the
varnish remains on the design forming a hard and attractive body which will
allow of a slight acidulation if it is desired to obtain a design finer than the
original. It is however better to ink it. This inking can be done with the
greatest simplicity just as if a transfer already prepared were inked..
If defects or weak points show themselves they are corrected as follows:-They
are resined and inked once or oftener until they are of the desired tone; then the
operation already explained is commenced, that is to say: the gumming removing
with spirit, and application of the varnish.

page_text: Having now particularly described and ascertained the nature of my said
Invention, and in what manner the same is to be performed, I declare that what
I claim is:-
1. The new varnish hereinbefore described composed of heavy benzine and
Judoa bitumen (mineral pitch), with or without essence of copaiva, in or in about
the proportions specified.
2. The method herein before described of applying the said varnish for fixing
lithographic or other transfers.