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Preparation Of Red Yellow Or Blue Tissues








Red Tissue.--Dissolve 10 grams of carmine in 1 liter of aqueous ammonia
and evaporate. When the smell of the alkali has almost disappeared, add 1
liter of rain water. Of this take 65 cubic centimeters, add 35 c.c.m. of
rain water, and in the solution let soak for an hour 15 grams of very
soluble gelatine, add 1 gram of sugar, and dissolve in a water bath.
Filter, and take of the mixture a sufficient quantity (25 c.c.m. for a
surface 18x24 centimeters) to cover a sheet of paper which has been
previously applied upon a glass plate in the following manner: In a tray
full of hot water, immerse the plate and the paper; remove the whole in
such a manner as the paper remains in contact with the plate; rub out the
excess of water with a squeegee, and flow the gelatine over the paper
still damp. Let cool on a leveled stand, and when the gelatine is
solidified to a consistent jelly, remove the paper from the plate and
place it to dry in an oven heated at not over 24 or 25 deg. C.

It is desirable that in drying the paper does not curl up. To that end,
apply over it, before it being removed from the plate a wooden frame to
which the gelatine, still sticky, will sufficiently adhere to hold the
tissue when it stretches in drying.

Yellow Tissue.--Pulverize to an impalpable powder 25 grams of light
chrome yellow in tablets (water color), and gradually add in stirring 1
liter of rain water. Take 100 c.c.m. of this and into it let soak for an
hour 15 grams of the same gelatine used for the red tissue, add 1 gram of
sugar, then proceed as above.

Blue Tissue.--In a liquid consisting of 85 c.c.m. of rain water and from
12 to 15 c.c.m. of blue ink, such as sold by stationers, let soak for an
hour 15 grams of the same gelatine and 1 gram of sugar, and proceed.

Preparation of Transfer Paper.--Two kinds of transfer paper are
employed--the enamel and plain transfer paper.

To enamel the paper: Dissolve 100 parts of barium nitrate in 500 parts of
water, and, on the other hand, 200 parts of sodium sulphate in the same
quantity of water. Mix, wash well the precipitate--barium sulphate--by
decantation, and when well drained, mix to the following solution:

Gelatine, Coignet's 300 parts
Glycerine 80 parts
Ultramarine blue 1 part
Crimson lake 0.1 part
Water 2,500 parts

Let soak the gelatine for, say, one hour, dissolve by heat, then add by
small quantities, stirring violently, 4 parts of chrome alum dissolved in
250 parts of hot water. Filter through flannel and coat the paper as
directed to prepare the tissue. The mixture should be employed
immediately after adding the chrome alum.

The plain transfer paper is prepared in the same manner, leaving out the
barium sulphate and the coloring matters.

Preparation of the Silver Paper.--Immerse the paper for two minutes in a
solution of--

Sodium chloride (common 2 parts
salt, dry)
Lemon juice 1 part
Water 100 parts (filter)

When dry and wanted for use, sensitize the salted paper by floating for
one minute on--

Silver nitrate 8 parts
Nitric acid 0.1 part
Water 100 parts

On its removal from the silver bath, sponge the paper between sheets of
blotting paper and hang it up to dry.

ENCAUSTIC FOR SINGLE TRANSFER PROOFS.
White wax 25 parts
Mastic 3 parts
Turpentine 100 parts

Dissolve by heat, first the mastic, then the wax, and keep for use in a
large mouthed vial.

MATT VARNISH.
Sandarac 6 parts
Mastic 6 parts
Lavender oil. 0.5 parts
Ether 100 parts

When dissolved, add 30 parts of benzine. The opacity of the film varies
with the quantity of benzine added; by excess the varnish dries
transparent.

WATER COLORS WHICH RESIST THE ACTION OF LIGHT.
Red. Indian red. Light red.
Orange. Mars yellow.
Blue. Cobalt blue. French blue. Smalt. New blue.
Brown. Raw umber. Burnt
sienna.
Green Terre verte.
Yellow. Cadmium Yellow Roman ochre.
yellow. ochre.





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