Library of amateur photography by American School of Art & Photography (Scranton Pa.) & Chambers Frank V

Author:American School of Art & Photography (Scranton, Pa.) & Chambers, Frank V
Language: eng
Format: epub
Tags: Photography -- 1915
Publisher: Philadelphia, Camera publishing co.
Published: 1915-03-25T05:00:00+00:00

567. Life of the Re-Developing Bath. —Both the bleaching and re-developing baths will retain their strength for some time if kept in well stoppered bottles; therefore, immediately after use the baths should be returned to the bottles and tightly corked. If the prints show a tendency to blister it doubtless comes from not having used sufficient hardener in the fixing bath, when making the black and white prints. Too strong a solution of re-developer, or an immersion of excessive length in this solution will also cause blisters. A salt bath after bleaching may be used if blistering is excessive, but should not be necessary if prints when first made are properly fixed in a fresh acid hypo bath. The use of pure aqua ammonia is recommended. The ordinary household ammonia should be avoided. This chemical clears the whites and does not change the tone unless an excessive amount is used.

568. A Special Re-Developing Bath That Will Not Blister. —For those who have experienced difficulty with the previously mentioned baths or prepared solutions, we can recommend the following formula. This formula should be prepared in three solutions and the solutions kept in tightly corked bottles.

569. Solution No. 1.—

Water 24 ozs.

Ferricyanide of Potassium 1 oz.

570. Solution No. 2.—

Water 24 ozs.

Bromide of Potassium 1 oz.

571. Solution No. 3. —

Water 48 ozs.

Sulphide of Soda ^ oz.

Note. —Do not confuse Sulphide with Sulphite.

572. For use mix equal proportions of 1 and 1. For example, if you find it necessary to use 4 ounces of solution use 2 ounces of No. 1 and 3 ounces of No. 2. Add to

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