| abstract |
PROBLEM TO BE SOLVED: To provide a first part for a two-part hair dye / bleaching composition comprising a first part containing an alkaline agent and a second part containing an oxidizing agent, wherein the first part is To provide a first agent which is excellent in a bleaching effect and a hair dyeing effect and in which scalp irritation is sufficiently reduced. SOLUTION: This is a first agent for a two-part hair dye / bleaching composition comprising a first agent containing an alkaline agent and a second agent containing an oxidizing agent, wherein (a) aqueous ammonia and At least one alkali agent selected from the group consisting of ethanolamine, (b) at least one water-soluble ammonium salt selected from the group consisting of ammonium carbonate and ammonium bicarbonate, (c) a polycarboxylic acid and At least one first p selected from the group consisting of And a two-part hair dye comprising: First agent for decolorizing composition. |