The present invention relates to novel cationic dye of formula (1) and (1a) ##STR00001## wherein A is an organic radical of formula (2) or (3) ##STR00002## wherein R.sub.1 and R.sub.2 are each independently of the other unsubstituted or substituted C.sub.1 C.sub.14alkyl or an aryl radical, R.sub.3 is hydrogen, unsubstituted or substituted C.sub.1 C.sub.14alkyl, unsubstituted or substituted C.sub.1 C.sub.14alkoxy, cyan or halogenid, R.sub.4 is hydrogen, unsubstituted or substituted C.sub.1 C.sub.14alkyl or an aryl radical, and X.sup.- is an anion.Further, the present invention relates to compositions thereof, especially comprising other dyes, to processes for the preparation thereof and to the use thereof in the dyeing of organic material, such as keratin, wool, leather, silk, paper, cellulose or polyamides, and preferably human hair.