| 摘要 |
To provide a first agent for oxidation hair dye in a constitution containing a carbonate in the first agent for oxidation hair dye, the first agent for oxidation hair dye being capable of improving stability of the dye, and a method for stabilizing a color tone of hair dyed by an oxidation hair dye composition. The present invention is concerned with a first agent for oxidation hair dye containing a carbonate, the first agent including (A) at least one selected from resorcin and its derivatives, and salts thereof, an upper limit of a compounding amount of the component (A) being 0.2% by mass or less, (B) at least one coupler selected from m-aminophenol, 5-amino-o-cresol, and ±-naphthol, and (C) 0.01 to 0.45% by mass of at least one dye intermediate selected from p-phenylenediamine, toluene-2,5-diamine, p-aminophenol, N,N-bis(2-hydroxyethyl)-p-phenylenediamine, and derivatives thereof, and salts thereof, a mass ratio of a content of the component (B) to a content of the component (A) being 0.5 to 10. |
