Abstract: Leuco dye compositions containing a compound of the formula: ##STR1## wherein m = 0 or 1: Ar is an arylene or lower alkyl substituted arylene radical;R.sub.1 and R.sub.2, which may be the same or different, are lower alkyl or hydroxyalkyl groups, or ##STR2## R.sub.3 is H, lower alkyl, benzyl, R.sub.4, or ##STR3## R.sub.5 is H, a C.sub.3 -C.sub.6 alkyl group, an aryl group, ##STR4## wherein n=2-6; and R.sub.6 is a lower alkyl group or an aryl group. Where m = 1, the formula represents a colorless leuco compound; where m = 0, the formula represents the yellow dye derivative of the leuco. These compounds are particularly useful in photosensitive compositions.

Abstract: Extremely bright, tinctorially strong disperse dyes derived from diaminomaleonitrile and selected aromatic and heterocyclic aldehydes, and their preparation, useful for dyeing and printing polyester and polyester-cotton blend fibers in yellow to blue shades of generally good fastness properties, which dyes are of the general formulaAr.sub.1 -CH=N-C(CN)=C(CN)-N=CH-Ar.sub.2wherein Ar.sub.1 and Ar.sub.2 are aromatic or aromatic-like groups, for example, phenyl or pyridyl.

Abstract: Compounds of the general formula: ##SPC1##Wherein m = 0 or 1;Ar is an arylene or lower alkyl substituted arylene radical;R.sub.1 and R.sub.2, which may be the same or different, are lower alkyl or hydroxyalkyl groups, or ##EQU1## R.sub.3 is H, lower alkyl, benzyl, R.sub.4, or ##EQU2## R.sub.4 is ##SPC2##Alkyl group, an aryl group, ##EQU3## wherein n=2-6; and R.sub.6 is a lower alkyl group or an aryl group. Where m = 1, the formula represents a colorless leuco compound; where m = 0, the formula represents the yellow dye derivative of the leuco. These compounds are particularly useful in photosensitive compositions.