Abstract: Photographic silver halide material developed in the presence of a novel antifogging or stabilizing compound which is present in the material and/or in the developing composition and corresponds to the following formula: ##STR1## wherein: Q is sulphur or seleniumX is sulphur, selenium or oxygenY is sulphur, selenium, oxygen or a single bond,R.sup.1 stands for an alkyl group having no nitrogen containing substituents or an aryl group,R.sup.2 represents the same groups as indicated for R.sup.1, provided that only when X represents sulphur or selenium nitrogen containing substituents of alkyl are excluded,R.sup.3 stands for hydrogen, carboxy in acid or salt form, an alkyl group or an aryl group, andR.sup.4 stands for hydrogen provided Y represents a single bond, an alkyl group having no nitrogen containing substituents, when Y represents sulphur or selenium and having no hydroxy substituents when Y represents a single bond and X as well as Q represent sulphur or selenium, or an aryl group,R.sup.3 and R.sup.

Abstract: Proteinaceous materials, especially gelatin, are hardened by incorporating therein at least one bis-epoxy compound corresponding to one of the formula: ##STR1## wherein: X represents a 1,4-piperazinylene group or a monomethyl or dimethyl-substituted 1,4-piperazinylene group, or represents a 1,2-pyrazolidinylene group,And n is 0 or an integer from 1 to 4.The proteinaceous material, especially the gelatin, is subsequently applied to form a photographic silver halide emulsion layer, a backing layer, a protective layer, a filter layer or any other photographic auxiliary layer.