Abstract: A hair dyeing composition comprising a special developer and a coupling agent is disclosed. The developer is a 4-aminophenol derivative substituted at the 2-position which is represented by the following formula (I), ##STR1## in which X represents a group --NHCOR.sup.1 (R.sup.1 is a linear or branched alkyl group having 1-5 carbon atoms), a group --COOR.sup.2 [R.sup.2 is a hydrogen atom, a linear or branched alkyl group having 1-5 carbon atoms, a monohydroxy alkyl group having 1-5 carbon atoms, a polyhydroxy alkyl group having 1-5 carbon atoms, or a group --(CH.sub.2).sub.n NR.sup.3 R.sup.4 (R.sup.3 and R.sup.4 individually represent a hydrogen atom or a linear or branched alkyl group having 1-5 carbon atoms, and n denotes an integer of 1-5)], a group --CONHR.sup.2, a nitrile group, a group --SO.sub.3 R.sup.2, or a group --SO.sub.2 NR.sub.2.sup.2 (R.sup.2 has the same meaning as defined above and the two R.sup.2 s may be the same or different), or a salt thereof.

Abstract: A dye composition for keratinous fibers comprising a specific type of trifluoromethylated aniline derivative, as a developer, and a coupling substance is disclosed. The composition provides high degree of saturation and vividness of colors as well as good fastness. Dyeing with the use of the dye composition ensures a variety of developer-coupling agent combinations, which can provide a wide variety of colors with a high degree of color saturation and vividness. The color produced possesses excellent light resistance, washing resistance, and wear resistance. Amoung the trifluoromethylated aniline derivative, used as a developer, a p-phenylenediamine-type trifluoromethylated aniline derivative of the following formula is a novel compound. ##STR1## in which X represents a specific type of mono- or polyhydroxyalkyl group, alkyl group, or other organic group.

Abstract: A dye composition for keratinous fibers comprising a specific type of trifluoromethylated aniline derivative, as a developer, and a coupling substance is disclosed. The composition provides high degree of saturation and vividness of colors as well as good fastness. Dyeing with the use of the dye composition ensures a variety of developer-coupling agent combinations, which can provide a wide variety of colors with a high degree of color saturation and vividness. The color produced possesses excellent light resistance, washing resistance, and wear resistance. Among the trifluoromethylated aniline derivative, used as a developer, a p-phenylenediamine-type trifluoromethylated aniline derivative of the following formula is a novel compound. ##STR1## in which X represents a specific type of mono- or polyhydroxyalkyl group, alkyl group, or other organic group.