| abstract |
A hair dye composition containing an azo dye (1) or a salt thereof:n nwherein R represents a coupler moiety, R 1 and R 3 each independently represent -SO 3 M, -SO 2 NR 4 R 5 or a hydrogen atom, R 2 , R 4 and R 5 each independently represent a hydrogen atom or a substituent, and M represents a hydrogen atom, metal atom or ammonium, with a proviso that R 1 and R 3 are not hydrogen atoms at the same time. |