Page 120 - The Wellington photographic handbook

COMBINED TONING AND FIXING BATH.*
Hypo 8 ounces 260 grammes
Citric Acid 20 grains 1£
Alum 200 „ 14
Lead Acetate ... ... ... 20 ,, \\
Hot Water to 30 ounces 1000 c.c.
The hypo is first dissolved in the hot water, and then the
other ingredients are added in the order named. The bath is
allowed to stand until cold, and the clear liquid decanted or filtered
off for use. Of this liquid six ounces (180 c.c.) are taken, and one
grain (7 c.c. of 1 per cent, solution) of gold chloride, dissolved in
water, added. As in other cases, the prints are much colder in
tone when dry.

FIXING "SELF-TONING" PAPER.
This paper is printed in the same way as the other kinds of
P.O. P., and always decidedly darker than the finished print should
appear. Prints on single weight paper should be placed in the
following bath without washing, but post-cards and prints on the
double weight grades should first be washed in running water
for 5 minutes.
FIXING BATH.
Hypo 6 ounces 300 grammes
Water to 20 1 litre
This fixing bath should be rendered alkaline by the addition
of 30 grains (2 grammes) of bicarbonate of soda, which prevents
sulphur-toning and subsequent fading of the print. The fixing
bath should not be of a lower temperature than 60° Fahr.
Fixing should be carried on until the desired tone is reached, which
should not take less than eight minutes it should be followed
;
by a thorough washing, for from half to one hour, in running water
if possible, if not, with frequent changes. It should be pointed
out that this paper is liable to slight yellowness with age, which,
however, entirely disappears in the fixing bath and is* in no way
detrimental to the quality of the finished print.
The darker the print, the stronger the fixing bath, and the
longer the prints are allowed to remain in the fixing solution, the
* Before making up any formula, read the notes on pages 1 26 and
1 25, 1 34.
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