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US 4,040,834 AGranted
Regeneration of photographic processing solutions
AssigneeFuji Photo Film Co., Ltd.
InventorsHaruhiko Iwano, Isao Shimamura
Life of this patent
Estimating the term…
Abstract
Image intensifying solutions containing cobalt (III) complex salts can be regenerated through concentration by means of reverse osmosis.
Claims8
In photographic processing involving image intensification of a photographic element comprising a substrate and at least one layer containing image-wise distributed silver in the presence of a reducing agent by application of a cobalt (III) complex having ligands selected from the group consisting of ammine, nitrite, nitrate, azide, chloride, thiocyanate, isocyanate and H.sub.2 O;
- a method for reusing the intensifier solution containing the cobalt (III) complex characterized by:
- subjecting used intensifying solution to reverse osmosis whereby the cobalt (III) complex is concentrated and unfavorable contaminants are removed, and
- adjusting the pH to about 4 to 10, said solution thereby being regenerated for further intensifying.
Dependencies are inferred from the claim text.