This dye comprises: a dimer obtained by oxidative copolymerization of 2,4-diaminophenoxyethanol and one compound selected from p-phenylenediamine, p-aminophenol, and 2,5-diaminotoluene； a trimer obtained by oxidative copolymerization of 2,6-diaminopyridine and one or two compounds selected from p-phenylenediamine, p-aminophenol, and 2,5-diaminotoluene； or a dimer obtained by oxidative self-polymerization of o-aminophenol. This hair dye contains said dye.本發明提供一種染料、及包含該染料之染毛劑，該染料包含：選自對苯二胺、對胺基苯酚及2,5-二胺基甲苯中之1種化合物與2,4-二胺基苯氧基乙醇進行氧化共聚而成之二聚物；選自對苯二胺、對胺基苯酚及2,5-二胺基甲苯中之1種或2種化合物與2,6-二胺基吡啶進行氧化共聚而成之三聚物；或鄰胺基苯酚進行氧化自聚而成之二聚物。
