Patent ID: 6927021

Claim:
A black and white silver halide photographic element comprising a support having thereon at least one light-sensitive silver halide emulsion layer said element comprising, in an amount sufficient to inhibit sludge deposition dining development, one or more compounds selected from compounds having the formula X—R 1 —CONH-A-S—S—B—NHCO—R 2 —Y (I) wherein A and B are each independently a substituted or unsubstituted aliphatic, alicyclic, aromatic or heterocyclic group; R 1 and R 2 are each independently a substituted or unsubstituted aliphatic, alicyclic, aromatic or heterocyclic group; X and Y are each independently a solubilising group; and compounds having the formula X—R 1 —CONH-A-S-M (II) wherein A, R 1 and X are as defined above, and M is either a hydrogen atom or a cationic species if the sulfur atom is in its ionised form.