Method for bleaching color photosensitive material
US4508816A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Oct 21, 1983 |
| Grant date | Apr 2, 1985 |
| Priority date | — |
| Expiry date | Oct 21, 2003 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG03C7/421
- WIPO fieldOrganic fine chemistry
- WIPO sectorChemistry
Abstract
An improved method for bleaching color photosensitive materials with a persulfate is provided. This method is free of offensive odors, can bleach efficiently color photosensitive materials containing a large amount of silver by using a persulfate, and can effectively bleach color photosensitive materials having colloidal silver layers by using a persulfate. The color photosensitive material used in the present invention contains at least one of the compounds represented by the formula I, salts thereof and precursors thereof: ##STR1## where R.sup.1 and R.sup.2 each independently represents a hydrogen atom, or an aliphatic residue and R.sup.1 and R.sup.2 may form a ring together with the N atom; R.sup.3 represents --R.sup.4 -- or --R.sup.4 --S, said --R.sup.4 -- being a divalent aliphatic residue; and X represents a divalent heterocyclic ring residue containing at least one atom selected from the group consisting of a nitrogen atom, an oxygen atom, and a sulfur atom.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.