New nitroaminophenols, the process for preparation thereof and their use in dyeing keratinous fibres, and new intermediate nitroaminobenzenes and their use in dyeing keratinous fibres.The invention relates to a nitroaminophenol of formula: ##STR1## in which Z denotes -CH.sub.2 W, W denoting H, C.sub.1 -C.sub.6 alkyl, C.sub.1 -C.sub.6 hydroxyalkyl, C.sub.2 -C.sub.6 polyhydroxyalkyl, (C.sub.1 -C.sub.3), alkoxy(C.sub.1 -C.sub.6)alkyl or (C.sub.1 -C.sub.3)hydroxyalkoxy(C.sub.1 -C.sub.6)-alkyl and R denotes H, (C.sub.1 -C.sub.6)alkyl, C.sub.1 -C.sub.6 hy-droxyalkyl, C.sub.2 -C.sub.6 polyhydroxyalkyl or (C.sub.1 -C.sub.3)-alkoxy(C.sub.1 -C.sub.6)alkyl, and the process for preparation thereof, and the intermediate compound of formula: ##STR2## in which R' denotes C.sub.1 -C.sub.6 hydroxyalkyl, C.sup.2 -C.sub.6 polyhydroxyalkyl or (C.sub.1 -C.sub.3)alkoxy(C.sub.1 -C.sub.6)alkyl and the process for preparation thereof.The dyes of formulae (I) and (II') can be used in direct dyeing of keratinous fibres, in particular, human hair.