This section is from the book "Complete Self-Instructing Library Of Practical Photography", by J. B. Schriever. Also available from Amazon: Complete Self-Instructing Library Of Practical Photography.
Use the regular A and B Pyro - Acetone solutions taking:
1 ounce A ...... | ...... 30 c.c.m. |
4 ounces B...... | ...... 120 c.c.m. |
2 ounces water.. . | ...... 60 c.c.m. |
Adding thereto 2 to 3 drams (8 to 10 c.c.m.) of a 10 per cent, solution of bromide of potassium.
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Rinse developed plates thoroughly to avoid carrying developer into the fixing bath and place in the following:
Acid - Fixing - and Hardening Bath.
A.- | - Water (1 gallon)....... | 128 ounces | 4 litres |
Hypo-Sulphite of Soda. . . . | 32 ounces | 1 kilo | |
(Which will test about 80 degrees by hydrometer.) | |||
B.- | - (See note below.) Water.... | 32 ounces | 1 litre |
Cramer's Dry Sulphite Soda. | 3 ounces | 90 grams | |
(Which will test 45 degrees by hydrometer.) | |||
Sulphuric Acid C. P...... | 1/2 ounce | 15 c.c.m. | |
Powdered Chrome Alum.... | 2 ounces | 60 grams |
Note. - Be sure to mix solution B exactly in given proportion and rotation. Always pour B into A while stirring well. If this is not done precipitation will take place.
During the cold season one-half the quantity of solution B is sufficient for full quantity of solution A.
B can also be prepared as follows:
Water..................... | . 32 ounces | 1 litre |
Potassium Meta bi - sulphite. | 3 ounces | 90 grams |
Powdered Chrome Alum. . . | 2 ounces | 60 grams |
This bath remains clear after frequent use, does not discolor the negatives, and hardens the film to such a degree that the negatives can be washed in warm water and dried by artificial heat if necessary. They should be left in the bath ten to twenty minutes after the bromide of silver appears to have been dissolved, to insure permanency, freedom from stain, and perfect hardening.
If the bath becomes exhausted by continued use, replace it by a new one.
Plain Fixing Bath.
Water | . 32 ounces | 1 litre |
Hypo - Sulphite of Soda. .. | 8 ounces | 250 grams |
(Which will test about 80 degrees by hydrometer.) |
Do not use the bath when it is discolored, it must be made fresh each day.
 
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