| abstract |
Disclosed is a one-pack hair dye composition which comprises (A) a combination of 5,6-dihydroxyindole and 5,6-dihydroxyindole-2-caroxylic acid, (B) either one of (b1) ascorbic acid or a salt thereof and (b2) sulfurous acid or a salt thereof, and (c) an alkali agent, and which has a pH value ranging from 8 to 11. Also disclosed is a method for controlling the color of the hair produced after hair dying. The method is achieved by properly selecting the type of the component (B). |