Method for preparing a ready-to-use photographic bleaching solution
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United States of America Patent
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May 19, 1998
Grant Date -
N/A
app pub date -
Apr 29, 1996
filing date -
Apr 29, 1996
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A ready-to-use bleaching or bleach-fixing solution can be prepared by mixing an aqueous solution of succinic acid, maleic acid or malic acid, and an aminopolycarboxylic acid ligand, adding a ferric salt to form a ferric ligand chelate, and adding a chemical base, such as ammonia, to provide a final pH of from 2.5 to 5.5. optionally, a portion of the chemical base can be added before the addition of the ferric salt.
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