Patent ID: 7270683

Claim:
A hair dye composition to be used as a mixture of a first part containing an alkali agent and a second part containing an oxidizing agent, wherein the composition comprises the following components (a) to (c): (a) a triazacyclononane compound represented by the following formula (1): wherein, R 1 , R 2 , R 3 and R 4 each represents a hydrogen atom or a C 1-6 alkyl group which may be substituted by a hydroxy group, R 5 , R 6 and R 7 each represents a hydrogen atom, a C 1-6 alkyl group which may have a substituent, an aralkyl group which may have a substituent, a heteroarylalkyl group which may have a substituent, an aryl group which may have a substituent, a heteroaryl group which may have a substituent, a C 1-6 acyl group which may have a substituent or a group represented by the following formula (2): (in which R 8 , R 9 , R 10 , R 11 and R 12 each represents a hydrogen atom, a C 1-6 alkyl group, an aralkyl group or an aryl group, and n stands for 2 to 30), or salt thereof, (b) 0.1 to 12 wt. %, in terms of hydrogen peroxide, of an oxidizing agent, and (c) 0.05 to 10 wt. % of an alkali agent; and the mixture has a pH of from 7.5 to 12.