The Salt Lake herald. [volume] (Salt Lake City [Utah]) 1870-1909, 1900-04-13
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=. The EiERAlD'S -.
Home Study Circle.
Copyright. 1883. BY Seymour Eaton,
Directed by Prof. Seymour Eatou.
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sufficient. The following are the de-
Ia1ls or the process.
Prepare a saturated solution of BIZ
cnloiIde OF mercury in water-that IS,
otssolve as much of the bichloride as
the water Will take up This can be
core by placing an ounce OF the chem
leal IN twelve or sixteen ounce bottle
ana hlling it with water. An occas-
loflai shake viii help solution, which
proceeds very slowly. The bottle should
De marked poison" Then dissolve
one and one-Quarter ounces OF lodlde
o. potassium in six ounces Of water.
The first solution should be poured into
the iooide a little at a time. A red
precipitate will at once form, which
VIII dissolve on shaking the bottle. A
point viii be reached when the forming
red precfDitate win no longer dissolve
by shaking. and when that happens no
more OF the mercury must be poured
IN. Be careful not to add more than
VIII be Just enough to make the solu-
llon very slightly turbid.. Now add
one ounce Of hyposulphite of soda, and
wnen this has dissolved add enough
water to the solution to make the total
oulk twenty ounces. For use this
should be diluted with about 8 parts
OF water. If the plate has not been
thoroughly fixed the intensifying solu-
tlon VIII produce yellow stains. The
NEGATIVE TO be intensified should be
soaked IN clean water for about half
an hour and then immersed in the in
tenslfier. 1t viii rapidly become denser
ana the progress can be watched by
noldlng It up and examining it with
the SKY Cor background. When dense
enough the negative should be washed
ana set aside to dry. Should the in
f91 7,
duced by placing the negative in the
nxlng bath for short time
Another very excellent single solu-
Ilon lntensifier is the platinum in
tenslfler. which is manufactured by a
Fnlladeiphia house. Full instructions
accompany the bottle. and the process
is an exceedingly simple one.
Local reduction and local intensified
Llon may often be done with advantage.
The negative is placed in a horizontal
position about a foot above a table,
on which is laid a sheet of white paper
70 reflect the light upward. The So
tuition Is applied to the necessary SPOT
py means OF q small brush. To pre-
vent spreading L is thickened by the
addition of little ordinary gum
Local reduction may also be done by
taking a small piece Of canton flannel
or cotton wool. dipping it in alcohol
and rubbing the spot gently. This
abrades the film and in point of fact
IS exactly similar TO sandpapeYing a
piece of wood.
Among minor troubles may be in
Guided small transparent spots, which
snow very distinctly on the prints as
small black specks. They are caused
by particles Of dust on the film at the
moment Of exposure or by air bells on
the film during development. The
remedy Is to spot each hole with
OPAQUE water color. applied with the
point of fine brush or the point of
a toothpick chewed soft and brush-fike
The film sometimes feels rough after
1t is dry. This is due to the presence
OF sand in the washing water. 1t can
be avoided by holding the plate under
the tap after washing is finished and
going over the film with wad of cot
ton wool or the palm of the hand.
Note-Four very attractive illus
trated studies VIII follow. The topics