PROBLEM TO BE SOLVED: To provide a hair-bleaching/dye-removing composition achieving sufficient bleaching activity while controlling the pH at mixing and preparation within a range of alkalescence, and capable of reducing the hair damage.SOLUTION: The hair-bleaching/dye-removing composition comprises the same or different preparations containing (A) one or more kinds selected from arginine and lysine and (B) ammonium persulfate, and a preparation containing hydrogen peroxide, and is regulated so that the ratio (A)/(B) of the formulated components (A) to (B) by mass at the mixing and preparation may be within the range of 0.25-1.86.COPYRIGHT: (C)2010,JPO&INPIT【課題】混合調製時のpHを弱アルカリ性の範囲にコントロールしながら、十分な脱色力を実現し、かつ毛髪損傷を低減することができる毛髪脱色/染毛剤組成物を提供する。【解決手段】(A)成分:アルギニン及びリジンから選ばれる1種以上と、(B)成分:過硫酸アンモニウムを含有する同一の又は異なる製剤と、過酸化水素を含有する製剤とからなり、混合調製時における(A)成分と(B)成分との質量基準の配合比率が(A)/(B)=0.25~1.86の範囲内である毛髪脱色/脱染剤組成物。【選択図】なし