PROBLEM TO BE SOLVED: To provide a hair bleaching / decontaminating agent capable of satisfactorily mixing a first agent and a second agent and enhancing the adhesion of the obtained mixed agent to hair. The hair bleaching / decontaminating agent of the present invention contains a first agent containing an alkaline agent and in the form of powder, an oxidizing agent, and a tertiary amine type cationic surfactant, and has a temperature of 25 ° C. At least a second agent having a viscosity of 11000 mPa · s or less is provided, and a solution obtained by mixing 2 parts by mass of the second agent with 1 part by mass of the first agent has a viscosity of 18,000 mPa · s at 25 ° C. That is all. [Selection diagram] None【課題】第１剤と第２剤とを良好に混合することができ、かつ得られる混合剤の毛髪への付着性を高めることができる毛髪脱色・脱染剤を提供する。【解決手段】本発明の毛髪脱色・脱染剤は、アルカリ剤を含み、かつ粉末状である第１剤と、酸化剤と、３級アミン型カチオン性界面活性剤とを含み、かつ２５℃での粘度が１１０００ｍＰａ・ｓ以下である第２剤とを少なくとも備え、前記第１剤１質量部に対して、前記第２剤２質量部を混合した液の２５℃での粘度が１８０００ｍＰａ・ｓ以上である。【選択図】なし
