| abstract |
A silver halide photographic light sensitive emulsion containing a hydrazine of the general formula n n R.sup.3 -NR.sup.4 -NR.sup.5 -G-X (I) n n in which n R 3 represents an aryl group, n one of R 4 and R 5 is a hydrogen and the other is selected from hydrogen, aryl sulphonyl and trifluoroacetyl, n G represents carbonyl, sulphonyl, sulphoxy, phosphoryl or an N-substituted or unsubstituted imino group and X is a moiety such that at a pH in the range of 9.5 to 12.5 in the presence of an oxidized hydroquinone a cyclization reaction takes place cleaving the moiety -G-X from the remainder of the molecule and forming a cyclic structure comprising atoms of the moiety -G-X. |