| abstract |
A N1,N4-dihydroxyethylated 2-nitro-p-phenylenediamine of formula (I), wherein R is C¿3-4? alkyl, and cosmetically acceptable salts thereof, for use in direct dyeing to give blue through purple shades which are wash-fast, light-fast, weatherproof and sweat resistant, and optionally combined with yellow and optionally red or orange-coloured dyes to give natural hues. |