Abstract: Quinoxalines of the formula ##STR1## are provided, in which R.sub.1 and R.sub.2 independently are lower alkyl R.sub.3 is lower alkyl, --CH.sub.2 OR.sub.5, --CH.sub.2 NRR', --CH.sub.2 OCOR, --CH.sub.2 Cl, --CH.sub.2 Br, --CH.sub.2 SR, --CH.sub.2 O(CH.sub.2).sub.p OR, --CH.sub.2 PO(OR.sub.5).sub.2, --CH.sub.2 PO(OR.sub.6).sub.2, --CH.sub.2 SO.sub.3 R.sub.6, --O(CH.sub.2).sub.m OR, --O(CH.sub.2).sub.p SO.sub.3 R.sub.6 or --(OCH.sub.2 CH.sub.2).sub.n OAr, R.sub.4 is hydrogen, lower alkyl or alkoxy when R.sub.3 is other than lower alkyl, or R.sub.4 is --OH, --NRR', --NHCOR, --NHCOAr', --NHSO.sub.2 R.sub.5 or --NHSO.sub.2 Ar', R and R' independently are hydrogen or lower alkyl, R.sub.5 is lower alkyl, R.sub.6 is hydrogen, an alkali metal cation or --N.sym.(R).sub.4, Ar is aryl or sulphonated aryl, Ar' is aryl or substituted aryl, m is 3 or 4, n is 1 to 3 and p is 2 to 4. The quinoxalines are useful as bleach catalysts, especially as dye bleach catalysts, for the photographic silver dye bleach process.

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 for the production of colored photographic images by the silver dye-bleach process by image-wise exposure and subsequent processing by developing the silver image, dye-bleaching and silver bleaching, it being possible, optionally, for the last two steps to be combined, silver fixing and washing, in which process dye-bleaching and/or silver bleaching is carried out in the presence of at least one bleach catalyst of the formula ##STR1## In the formula, A and B are in each case the non-metallic atoms necessary to complete a benzene or pyridine ring, R.sub.1 and R.sub.3 are each hydrogen, hydroxyl, halogen, alkyl, carboxyl, carbalkoxy, carbalkoxyalkoxy, --CH.sub.2 OH, --O(CH.sub.2).sub.n OH, --O(CH.sub.2).sub.2 O(CH.sub.2).sub.2 OH, --CH.sub.2 Cl, --CH.sub.2 Br, --NR.sub.5 R.sub.6, --CH.sub.2 NR.sub.5 R.sub.6, --O(CH.sub.2).sub.n NR.sub.5 R.sub.6, --CH.sub.2 SO.sub.3 M, --O(CH.sub.2).sub.n SO.sub.3 M or --SO.sub.3 M, R.sub.2 and R.sub.4 are each hydrogen, hydroxyl, alkyl or alkoxy and R.sub.5 and R.sub.

Abstract: Quinoxalines of the formula ##STR1## are provided, in which R.sub.1 is hydrogen if R.sub.3 and R.sub.4 conjointly are --O(CH.sub.2).sub.p O--, or is --CH.sub.2 OR, --CH.sub.2 NRR', --CH.sub.2 OCOR, --CH.sub.2 Cl, --CH.sub.2 Br, --CH.sub.2 CN, --CH.sub.2 SR, --CH.sub.2 SCN, --CH.sub.2 O(CH.sub.2).sub.m OR, --CH.sub.2 (OCH.sub.2 CH.sub.2).sub.n OR, --CH.sub.2 SO.sub.2 R.sub.5, --CH.sub.2 PO(OR.sub.5).sub.2, --CH.sub.2 SO.sub.3 R.sub.6 or --CH.sub.2 PO(OR.sub.6).sub.2 and R.sub.2 is lower alkyl, --CH.sub.2 PO(OR.sub.5).sub.2, --CH.sub.2 PO(OR.sub.6).sub.2 or CH.sub.2 SO.sub.3 R.sub.6, R.sub.3 and R.sub.4 independently are lower alkyl, lower alkoxy, RO(CH.sub.2).sub.m O-- or RO(CH.sub.2 CH.sub.2 O).sub.n -- or R.sub.3 and R.sub.4 conjointly are --O(CH.sub.2).sub.p O--, R and R' independently are hydrogen or lower alkyl, R.sub.5 is lower alkyl, R.sub.6 is hydrogen, an alkali metal cation or --N.sup..sym. (R).sub.4, m is 3 or 4, n is 1 to 3 and p is 1 or 2.

Abstract: Quinoxalines of the formula ##STR1## are provided, in which R.sub.1 and R.sub.2 independently are lower alkyl R.sub.3 is lower alkyl, --CH.sub.2 OR.sub.5, --CH.sub.2 NRR', --CH.sub.2 OCOR, --CH.sub.2 Cl, --CH.sub.2 Br, --CH.sub.2 SR, --CH.sub.2 O(CH.sub.2).sub.p OR, --CH.sub.2 PO(OR.sub.5).sub.2, --CH.sub.2 PO(OR.sub.6).sub.2, --CH.sub.2 SO.sub.3 R.sub.6, --O(CH.sub.2).sub.m OR, --O(CH.sub.2).sub.p SO.sub.3 R.sub.6 or --(OCH.sub.2 CH.sub.2).sub.n OAr, R.sub.4 is hydrogen, lower alkyl or alkoxy when R.sub.3 is other than lower alkyl, or R.sub.4 is --OH, --NRR', --NHCOR, --NHCOAr', --NHSO.sub.2 R.sub.5 or --NHSO.sub.2 Ar', R and R' independently are hydrogen or lower alkyl, R.sub.5 is lower alkyl, R.sub.6 is hydrogen, an alkali metal cation or --N.sup..sym. (R).sub.4, Ar is aryl or sulphonated aryl, Ar' is aryl or substituted aryl, m is 3 or 4, n is 1 to 3 and p is 2 to 4.The quinoxalines are useful as bleach catalysts, especially as dye bleach catalysts, for the photographic silver dye bleach process.

Abstract: Quinoxalines of the formula ##STR1## are provided, in which R.sub.1 is hydrogen if R.sub.3 and R.sub.4 conjointly are --O(CH.sub.2).sub.p O--, or is --CH.sub.2 OR, --CH.sub.2 NRR', --CH.sub.2 OCOR, --CH.sub.2 Cl, --CH.sub.2 Br, --CH.sub.2 CN, --CH.sub.2 SR, --CH.sub.2 SCN, --CH.sub.2 O(CH.sub.2).sub.m OR, --CH.sub.2 (OCH.sub.2 CH.sub.2).sub.n OR, --CH.sub.2 SO.sub.2 R.sub.5, --CH.sub.2 PO(OR.sub.5).sub.2, --CH.sub.2 SO.sub.3 R.sub.6 or --CH.sub.2 PO(OR.sub.6).sub.2 and R.sub.2 is lower alkyl, --CH.sub.2 PO(OR.sub.5).sub.2, --CH.sub.2 PO(OR.sub.6).sub.2 or CH.sub.2 SO.sub.3 R.sub.6, R.sub.3 and R.sub.4 independently are lower alkyl, lower alkoxy, RO(CH.sub.2).sub.m O-- or RO(CH.sub.2 CH.sub.2 O).sub.n -- or R.sub.3 and R.sub.4 conjointly are --O(CH.sub.2).sub.p O--, R and R' independently are hydrogen or lower alkyl, R.sub.5 is lower alkyl, R.sub.6 is hydrogen, an alkali metal cation or --N.sup..sym. (R).sub.4, m is 3 or 4, n is 1 to 3 and p is 1 or 2.

Abstract: A method of processing photographic silver dye bleach materials which have been exposed imagewise is provided. The process steps are (1) silver developing, (2) dye bleaching, (3) silver bleaching and (4) fixing. The treatment baths for the process steps (2), (3) and (4), or the combined treatment baths useful for process step (3) with at least one the process steps (2) or (4) contain water-soluble tertiary phosphines as silver ligands. These phosphines effect an acceleration of the dye and silver bleaching and they are further suitable stabilizers and optionally antioxidants which yield stable treatment baths.