PROBLEM TO BE SOLVED: To provide an oxidant composition obtaining an excellent hair clarity-improving effect even on blending a large amount of hydrogen peroxide, and without accompanying inconvenience based on the excessive blending of the hydrogen peroxide or an alkali agent.SOLUTION: This oxidant composition prepared as a type of using a plurality of agents, which is mix-prepared at the time of use, comprises each of component (A): a 3.5 to 6 mass% hydrogen peroxide at the time of use, component (B1): a strong alkali and component (B2): ammonia, an ammonium salt or an alkanol amine, and having &alpha&ge&beta for the pH value &alpha at the time of use of the composition with respect to the dissociation constant (pKa) value &beta of the component (B2).COPYRIGHT: (C)2009,JPO&INPIT【課題】多量の過酸化水素を配合したもとで優れた毛髪明度向上効果が得られ、過酸化水素やアルカリ剤の過剰配合に基づく不具合を伴わない酸化剤組成物を提供する。【解決手段】使用時に混合調製される複数剤式に製剤され、(A)成分:使用時3.5~6質量%の過酸化水素、(B1)成分:強アルカリ、(B2)成分:アンモニア、アンモニウム塩又はアルカノールアミンの各成分を含有し、使用時のpH値αが(B2)成分の解離定数(pKa)値βに対してα≧βである酸化剤組成物。【選択図】なし
