Abstract Dyes having the general formula <FORM:1002345/C4-C5/1> wherein R1 and R2 are benzine residues having the azo and -O-Cu-O- links in ortho position, the azo and azoxy groups being linked to R2 in para position, are prepared by condensing 1 mol. of 4,41-dinitro-stilbene-2,21-disulphonic acid with two mols. of an amino-azo dye of the formula HO3S-R1(OH)-N = N-R2(OCH3)-NH2 and then demethylating the methoxy groups and metallizing with a copper compound. The amino-azo dye is itself prepared by coupling the diazonium salt of an o-hydroxyamine of the formula HO3S-R1(OH)-NH2 with an amine of the formula H-R2(OCH3)-NH2. The benzene residue R2 may have additional substituents in para position to the methoxy group (i.e. to the -O-Cu-O-linkage in the final dye) such as methyl, methoxy or ethoxy substituents. The benzene residue R1 also may have additional substituents such as chloro, methyl, ethyl, nitro or further sulphonic acid groups.
A PHOTOGRAPHIC SILVER HALIDE GELATINE LAYER FOR THE SILVER DYESTUFF BLEACHINGMETHOD CONTAININ AS AN MAGE DYESTUFF AN AZAXY DYESTUFF OF THE FORMULA R8-N=N-R7-N(=O)=N-R7-N=N-R8'' WHEREIN R7 REPRESENTS A MONOCYCLIC BENZENE RING BOUND TO THE AZO GROUP IN 1-POSITION AND TO THE AZOXY GROUP IN 4-POSITION AND CONTAINING IN5-POSITON A SUBSTITUENT SELECTED FROM THE GROUP CONSISTING OF AN ALKOXY GROUP AND A HYDROXY-ALKOXY GROUP CONTAINING AT MOST 5 CARBON ATOMS, AND R6 AND R8'' EACH REPRESENT THE RADICAL OF AN 8-HYDROXYNAPHTHALENE-DISULFONIC ACID BOUND TO THE AZO GORUP IN ITS 7-POSITION AND CONTAINING IN ITS 1-POSITION A MEMBER SELECTED FROM THE GROUP CONSISTING OF A PHENYLAMINO GROUP, A CYCLOHEXYLAMINO GROUP, A BENZOYLAMINO GROUP, A PARA-TOLUENESULFONYLAMINO GROUP AND A 1-(3''CARBOXY-4''-HYDROXYBENZENESULFONYLAMINO)GROUP.