Photographic silver halide emulsion material containing an antifoggant precursor

A photographic material which comprises a support and at least one light-sensitive silver halide emulsion layer and wherein there is at least one antifoggant precursor in the said emulsion layer and/or a hydrophilic colloid layer in water-permeable relationship with such an emulsion layer, characterized in that there is at least one said precursor which corresponds to one of the following general formulae (I A), (I B), (II A), (II B), (III A) or (III B):

• ##STR26## wherein:
• each of Y.sup.1 and Y.sup.2 (same or different) is an acyl group, each of Y.sup.10 and Y.sup.20 (same or different) is an aromatic acyl group,
• R is an alkyl group, an aryl group, a heterocyclic nitrogen-containing 5-, 6- or 7-membered ring,
• R.sup.1 is hydrogen, an alkyl group, an aryl group, a carboxyl group in free acid, salt or esterified form, or a carbamoyl group,
• R.sup.2 is hydrogen, an alkyl group or an aryl group,
• R.sup.3 has the same meaning as Y.sup.10 but need not be identical thereto, or is hydrogen, an alkyl group, an aryl group, or a R.sup.7 -S- group wherein R.sup.7 is an alkyl group, an aryl group, or a heterocyclic group,
• R.sup.4 is hydrogen, an aryl group or a heterocyclic group,
• R.sup.5 is hydrogen, an alkyl group, an aryl group or a heterocyclic group, and
• Z represents the necessary atoms to close a nitrogen-containing 5-, 6- or 7-membered heterocyclic ring.