PROBLEM TO BE SOLVED: To prevent the reduction of hair-dyeability or the aggravation of hair feeling in the case of blending an alkali metal silicate in a large amount with an oxidative hair dyestuff, while maintaining high clarity of the hair.SOLUTION: This oxidative hair dyestuff composition is provided by containing an oxidant (A), the alkali metal silicate (B), a chelating agent (C), and an oxidative dyestuff intermediate (D), having pH&ge9.4 at the time of use, containing the &ge2.0 mass% component (B) as a blending amount at the time of use and also having the ratio of the blending amounts of the component (B) to the component (C) at the time of use, (B/C) as 1&leB/C&le10.COPYRIGHT: (C)2009,JPO&INPIT【課題】酸化染毛剤にケイ酸のアルカリ金属塩を多量に配合した場合における染毛力の低下や毛髪の感触悪化を、毛髪の高明度を維持しながら、防止する。【解決手段】(A)酸化剤、(B)ケイ酸のアルカリ金属塩、(C)キレート剤、(D)酸化染料中間体を含有する酸化染毛剤組成物であって、使用時pHが9.4以上であり、(B)成分を使用時配合量として2.0質量%以上含有し、かつ(B)成分と(C)成分の使用時配合量の比B/Cが1≦B/C≦10である酸化染毛剤組成物。【選択図】なし
