Los Angeles herald., 1910-05-01
PRINTS ON VARIOUS SUPPORTS


leather and oil-cloth. The latter need
not have a substratum. The collodion
should give a tough and horny hlm,
or it VIII not strip from its hrst glass
support Bromo-iodised collodion, such
as is used for ferrotype work, answers
we'll glass plate is coated and PRINT
ed in the usual way. Cyanide of potas-
sium should be used for fixing. Both
leather and glass positives are wiped
over with plenty of it-photographic
alcohol 1 or. nitric acid (9S deg0, 10
drops, and the leather carefully laid
down on the film. Both ara now placed
in a printing frame, backed with blot
ting paper and left for an hour or
two. when the collodion film will be
found to adhere to the leather when
the latter is raised.
In the case of transferring an image
(Weak negatiVe) on a gelatine plate
the developed image is given a bath
of 10 per cent chrome alum for ten
minutes, and then well washed and
dried. 1t is then converted into a posi-
tive by bleaching in
Potass bromide grs'
Mercury bchloride ..........,.............6 grs'
Distilled water .......'.''.'''.... .'...'-o jas
Half the water is used boiling to
dissolve the salts and the other half
added when cool. A little citric acid,
about 120 grs. dissolved in ozs. of
water may be added to the solution
to keep the shadows clear.
The bleached plate is washed for
fifteen minutes, and stood aside to
dry.
1t is then stripped by immersing in
Sodium fuoride grs.
Water .'....'.'.''..'.'-''' ozs'
Citric acid ........... ..'''''.'.'.'''''Efo srs'
Water ................... '..'''''''''''''' o@S'
Of hn oil m
together and used in a vulcanite dish.
The gelatine film quickly Fuckers up,
and can be removed to a tray of clean
water. The patent leather is rubbed
over with sugar syrup to remove
greasiness, the gelatine film removed
from it's water, dried slightly and laid
down on the leather. The two are
dried together in horizontal position.
To transfer to celluloid the latter
must be given a coat of gum solution
first. The liquid is rinsed off under
the tap for a moment, but enough is
left to provide for the adhesion of the
gelatine.
Photographs on Watch Case-A. ].
Jarman recommends for this purpose
carbon tissue of the kind known as
Lambertype, which is of a purple tint.
1t is sensitised for about three minutes
in a solution made as follows:
Bichromate of potash p)............ ozs.
Carbonate CT ammonia ................"..4O 40 grs
Water ................ ....-..'''...'''''''oO o%s
When the above is completely dis
solved, add the following:
Salicylic acid dissolved in ozs. boiling
water) ....,............... ............'..4O BIS
Glycerine ................ ...'''.'..''''So orops
Add this to the bichromate solution,
shake it well, filter it either through
absorbent cotton or ordinary filtering
paper. AS soon as it is quite cold it
will be ready for use.
Reverse negatives are prepared and
printing done in the ordinary way.
The watch case lid is thoroughly
cleaned in a weak caustic potash solu-
tion, the interior surface being rub
bed with cotton wool until no greasy
effect is noticed when the case is
flooded with water. The case is then
dipped in a sugar syrup made by dis
solving half a pound of granulated su-
gar in half a pint of boiling water, al
lowing to stand until cold and bottling
for use. The exposed tissue is soaked
for moment in water until limp, the
watch case removed from the syrup,
and the print pressed down after the
excess of water has been blotted from
it. After standing for ten minutes the
print is developed in warm water, is
placed in alum solution for two min
utes when completely visible, and fin
ally washed. When quite dry it Is Civ
en- a coating of celluloid varnish or
amyl acetate collodion.
MERCURY-IoDIDE INTENsIFIER