Hair dye composition comprising a direct dye

摘要

Provided is a hair dye composition comprising as a direct dye a compound represented by the following formula (2): <CHEM> wherein, R<1> and R<1'> each independently represents a (substituted) C1-6 alkyl or a (substituted) aryl group; A and A' each independently represents a divalent (substituted) aryl group; R<2> and R<2'> each independently represents H, a (substituted) alkyl or a (substituted) aryl group, or R<2> or R<2'> may be bonded to A or A', thereby forming a heterocycle, R<2> and R<2'> are coupled to form a heterocycle, together with the adjacent atom; Q represents a divalent organic group; and An<-> represents an anion). The hair dye composition according to the present invention has markedly high hair dyeing power, has less color fade over time and undergoes a small color tone change in the dye even after storage.