Claims
- 1. In a color process reversal for the production of photographic images by image-wise exposure of a light-sensitive photographic material containing at least one silver halide emulsion layer, black and white development, preliminary to second development, treating the developed layer with a stabilizing bath containing fogging metal complexes and then subsequently color developing the material so treated with the improvement wherein said bath having a pH of 3 to 8 containing, in the absence of a color developing agent, a fogging metal complex selected from the group consisting of carboxylic acid and phosphonic acid complexes of tin-II ions with a stabilizing amount of at least one stabilizer or a salt thereof which comprises a compound of the following general formula or a tautomeric form thereof
- wherein
- R.sup.1 and R.sup.2 which are the same or different, represent hydrogen,
- a saturated or unsaturated aliphatic group, an aryl group, a heterocyclic group or an acyl group;
- X represents OR.sup.3 or NR.sup.4 R.sup.5 wherein R.sup.3, R.sup.4 and R.sup.5, which are the same or different, are defined as R.sup.1 ;
- and/or R.sup.1 and R.sup.2 together represent the ring members required for
- 2. The process according to claim 1 characterized in that
- R.sup.1 represents a saturated or unsaturated aliphatic group, an aryl group, a heterocyclic group or an acyl group,
- 3. The process according to claim 1 characterised in that the stabilizing
- 4. The process according to claim 1, characterised in that at least one tin-II complex of citric acid and/or of 1,2,4-tricarboxybutane-2-phosphonic acid is used as fogging metal complex.
- 5. In a fogging bath for color reversal processing of silver halide containing photographic materials which bath composition contains in the absence of a color-developing agent a fogging agent capable of fogging imagewise exposed and black and white developed silver halide containing photographic materials,
- the improvement which comprises the bath having a pH of from 3 to 10 and containing in solution a buffering agent for maintaining said pH and a fogging metal complex, selected from the group consisting of carboxylic acid and phosphonic acid complexes of tin-II ions and a stabilizing amount of at least one stabilizer or a salt thereof which is a compound of the following general formula or to a tautomeric form thereof ##STR7## wherein R.sup.1 and R.sup.2 which are the same or different, represent hydrogen, a saturated or unsaturated aliphatic group, an aryl group, a heterocyclic group or an acyl group;
- X represents OR.sup.3 or NR.sup.4 R.sup.5, wherein R.sup.3, R.sup.4 and R.sup.5 which are the same or different, are defined as R.sup.1 ;
- and/or R.sup.1 and R.sup.2 together represent the ring members required for completing a 5-membered or 6-membered ring.
- 6. The bath according to claim 5 characterised in that
- R.sup.1 represents a saturated or unsaturated aliphatic group, an aryl group, a heterocyclic group or an acyl group,
- X represents OH.
- 7. The bath according to claim 5 characterized in that it contains hydroxylammonium sulphate as stabilizing agent.
- 8. The bath according to claim 5 characterized in that it contains at least one tin-II complex of citric acid and/or of 1,2,4-tricarboxybutane-2-phosphonic acid as fogging metal complex.
Priority Claims (1)
Number |
Date |
Country |
Kind |
2744356 |
Oct 1977 |
DEX |
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CROSS REFERENCE
This is a continuation of Applicant's copending U.S. Application Ser. No. 946,361 filed Sept. 27, 1978 for "Photographic Reversal Process Without Second Exposure" by Ubbo Wernicke, now abandoned.
US Referenced Citations (8)
Foreign Referenced Citations (4)
Number |
Date |
Country |
25956 |
Jul 1971 |
JPX |
38816 |
Sep 1972 |
JPX |
1467007 |
Mar 1977 |
GBX |
1515167 |
Jun 1978 |
GBX |
Continuations (1)
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Number |
Date |
Country |
Parent |
946361 |
Sep 1978 |
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