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Abstract

A process for removing stain in a photographic material is described which process comprises incorporation of at least one compound of formula (I) wherein X is O or NH; n is 1 or 2, p is 0, 1 or 2, M is hydrogen, an alkali metal atom, ammonium or a cation formed from an amine; each R.sub.1, independently, is an amimoacid residue from which a hydrogen atom on the amino group has been removed; each R.sub.2, independendy, is hydrogen, C.sub.1 -C.sub.8 alkyl, C.sub.1 -C.sub.8 alkoxy, halogen, cyano, COOR, wherein R is hydrogen or C.sub.1 -C.sub.3 alky1, CONH--R in which R has its previous significance, SO.sub.2 NH--R in which R has its previous significance, NH--COR in which R has its previous significance, or SO.sub.3 M, wherein M has its previous significance, or, if n is 1, R.sub.2 can also be CO--R.sub.3 in which R.sub.3 is C.sub.1 -C.sub.3 alkyl or phenyl, in that photographic material. ##STR1##

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