Abstract: A method for processing exposed silver dye-bleach materials using novel preparations for combined dye bleaching and silver bleaching is described. In addition to a strong acid, a water-soluble iodide, a water-soluble oxidizing agent, an antioxidant and, if desired, a bleaching accelerator, these preparations also contain a mixture of 1,4- or 1,2-diazines as bleach catalysts. This mixture consists either of at least two bleach catalysts with redox potentials between +105 mV and -30 mV, the difference between the redox potentials of the catalysts being at least 15 mV, or of at least one bleach catalyst with a redox potential between +60 mV and -30 mV and at least one bleach catalyst with a redox potential between -30 mV and -100 mV, the difference between the redox potentials of the catalysts likewise being at least 15 mV.When exposed dye-bleach materials are processed using these preparations, images with improved color quality are obtained.

Abstract: A process is described for the prevention of darkening and the formation of a sediment in photographic developer solutions which contain a silver halide developer, a water-soluble silver halide solvent and organic sulfur compounds. The organic sulfur compounds are a combination of (a) an organic thiol compound or thione compound capable of tautomerism and (b) a Bunte salt which contains groups conferring solubility in water. Developer solutions which contain the indicated combination of sulfur compounds are outstandingly stable.

Abstract: The present invention provides a new process for the production of masked subtractive positive color images by the silver dye bleach process, which comprises the steps of exposure, silver developing, dye-bleaching, silver-bleaching and fixing.

Abstract: A process for developing photographic silver halide material, which has been exposed image-wise is provided. The aqueous developer preparation used contains a developer compound for the silver halide, a water-soluble solvent for the silver halide and an aliphatic, cycloaliphatic, aromatic or heterocyclic di- or trisulphide. These preparations remain clear over a long period of time during which they do not lose their effectiveness by becoming turbid or by sedimentation of silver. They are of special advantage in continuously operated photographic developing processes.

Abstract: The present invention relates to a process for the production of masked subtractive positive color images in accordance with the silver dye bleach process. In the material to be processedA. a silver halide emulsion layer consisting at least partially of silver iodide is allocated to the dyestuff, of which the undesired parasitic color density is to be compensated,B. in a further layer, at least one second dyestuff, of which the main color density corresponds to a parasitic color density, requiring compensation, of the first dyestuff, and a silver halide emulsion free from iodide ions, are present,C. a further layer, which is adjacent to that containing the second dyestuff, contains colloidal nuclei which are capable of depositing metallic silver from soluble silver complexes,D. a separating layer is present between the layer containing the nuclei and the dyestuff layer, of which the parasitic color density is to be compensated.

Abstract: The present invention relates to a new method for processing silver dye bleach material. The process measures of this method, consisting of (1) silver developing, (2) dye bleaching, (3) silver bleaching, (4) silver fixing are carried out in the sequence (1) to (4) with appropriate preparations. The silver bleaching (3) preparation contains (a) a strong acid, (b) a water-soluble iodide, (c) a water-soluble oxidizing agent, (d) a diazine compound and (e) an anti-oxidant. An excellent and rapid bleaching is achieved.

Abstract: The present invention relates to a simplified method for processing silver dye bleach material by (1) silver developing, (2) dye and silver bleaching (3) silver fixing and (4) soaking. The sequence (1), (2), (3), (4) is followed and the bleaching bath (2) contains (a) a strong acid, (b) a water-soluble iodide, (c) a water-soluble oxidizing agent (d) an antioxidant and (e) a dye bleach catalyst.

Abstract: The invention relates to a dye bleach preparation which contains in addition to an acid, a water-soluble iodide and optionally a dye bleach catalyst at least one bifunctional sulphur compound having a sufficient solubility in the preparation and a low vapor pressure and containing at least one HS-group and at least one oxygen, nitrogen, phosphorus or additional sulphur atom, the sulphur atom of each HS-group being separated from the next oxygen, sulphur, nitrogen and phosphorus atom present in the molecule by at least three carbon atoms.The subject of the present invention is a dye bleach preparation for the photographic silver dye bleach process, which contains an acid, a water-soluble iodide and optionally a dye bleach catalyst. The preparation is characterised in that it contains at least one organic, at least bifunctional sulphur compound of which the solubility is at least 5.times.10.sup.-.sup.4 mol per liter of preparation and of which the vapour pressure in the temperature range of -20.degree.