A silver halide photographic light sensitive emulsion containing a hydrazine of the general formula R.sup.3 -NR.sup.4 -NR.sup.5 -G-X (I) in which: R.sup.3 represents an aryl group, one of R.sup.4 and R.sup.5 is a hydrogen and the other is selected from hydrogen, aryl sulphonyl and trifluoroacetyl, 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.
一种含有通式为R.sup.3-NR.sup.4-NR.sup.5-G-X (I)的
肼的
银卤化物感光乳剂,其中:R.sup.3代表芳基,R.sup.4和R.sup.5中的一个是氢,另一个选自氢、芳基磺酰基和三
氟乙酰基,G代表羰基、磺酰基、磺氧基、
磷酰基或N-取代或未取代的
亚胺基,X是一种基团,在存在氧化的
对苯二酚的情况下,在pH值为9.5到12.5的范围内发生环化反应,将基团-G-X从分子的其余部分中断裂,并形成由基团-G-X的原子构成的环状结构。