Disclosed are nitro-sulfide dyes of formula (1), their salts, isomers, hydrates and other solvates, wherein R.sub.1, R.sub.2, R.sub.3, independently from each other are hydrogen; C.sub.1-C.sub.20alkyl or C.sub.1-C.sub.20alkoxy, which may be substituted by one or more C.sub.1-C.sub.5alkoxy, halogen, --NH.sub.2, mono-C.sub.1-C.sub.5alkylamino, di-C.sub.1-C.sub.5alkylamino, --NO2 or hydroxy; C.sub.3-C.sub.6cycloalkyl; --C(O)H; --C(O)--C.sub.1-C.sub.5alkyl; --C(O)OH; --C(O)O--C.sub.1-C.sub.5alkyl; halogen; NO.sub.2; OH; SH; phenyl, which may be substituted by one or more C.sub.1-C.sub.5alkyl, C.sub.1-C.sub.5alkoxy, halogen, --NH.sub.2, mono-C.sub.1-C.sub.5alkylamino, di-C.sub.1-C.sub.5alkylamino, --NO.sub.2 or hydroxy; or a radical of formula (1a) --NR.sub.4R.sub.5, wherein R.sub.4 and R.sub.5 independently from each other are hydrogen; C.sub.1-C.sub.12alkyl, which may be substituted by one or more C.sub.1-C.sub.5alkyl, C.sub.1-C.sub.5-alkoxy, hydroxy or --(CO)--H; --(CO)--C.sub.1-C.sub.5alkyl; phenyl or phenyl-C.sub.1-C.sub.4alkyl, wherein the phenyl moiety may be substituted by one or more C.sub.1-C.sub.5alkyl, C.sub.1-C.sub.5alkoxy, halogen, --NH.sub.2, mono-C.sub.1-C.sub.5alkylamino, di-C.sub.1-C.sub.5alkylamino, --NO.sub.2, carboxy or hydroxy; or a radical of formula (2); wherein at least one of the radicals R.sub.1, R.sub.2 or R.sub.3 is NO.sub.2; Y.sub.1 is C.sub.1-C.sub.10alkylene; C.sub.5-C.sub.10cycloalkylene; C.sub.5-C.sub.10arylene; or C.sub.5-C.sub.10arylene-(C.sub.1-C.sub.10alkylene); Z1 is the direct bond; formula (3); or a cationic biradical of a saturated, aromatic or heteroaromatic group; Q.sub.1 is --C(O)--; --C(O)O--; --OCO--; --N(R.sub.6)--X.sub.2--; --CON(R.sub.6)--; --(R.sub.6)NC(O)--; --O--; --S--; --S(O)--; or --S(O).sub.2--; X.sub.1 and X.sub.2 independently from each other are the direct bond; C.sub.1-C.sub.10alkylene; C.sub.5-C.sub.10cycloalkylene; C.sub.5-C.sub.10arylene; or C.sub.5-C.sub.10arylene-(C.sub.1-C.sub.10alkylene); and R.sub.6, R.sub.7 and R.sub.8 independently from each other are hydrogen; C.sub.1-C.sub.14alkyl; C.sub.2-C.sub.14alkenyl; C.sub.6-C.sub.10aryl; C.sub.6-C.sub.10aryl-C.sub.1-C.sub.10alkyl; or C.sub.1-C.sub.10alkyl(C.sub.5-C.sub.10aryl); m is 1; or 2; U is hydrogen, if m is 1; or the direct bond, if m is 2; with the proviso that the method does not comprise contacting hair with an enzyme of the type of a protein disulfidisomerase (EC 5.3.4.1). Further, the present invention relates to novel sulfide compounds, compositions thereof, especially comprising other dyes, and to processes for their preparation.

 
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