A second preparation composition for aerosol-type hair dying or hair bleaching, which is mixed with a first preparation composition containing an alkaline agent upon use, and which contains the components (A) to (D) mentioned below, wherein the ratio of the total amount of the components (C) and (D) to the amount of the component (B), i.e., [(C)+(D)]/(B), is 1.0 to 3.5 inclusive by mass and the ratio of the amount of the component (D) to the amount of the component (C), i.e., (D)/(C), is 1.2 to 2.2 inclusive by mass: (A) hydrogen peroxide； (B) a nonionic surfactant； (C) a higher alcohol； and (D) a hydrocarbon.一種噴霧型染毛用或毛髮脫色用第2劑組合物，其係與含有鹼劑之第1劑組合物混合而使用者，其含有下述成分(A)～(D)，且成分(C)與(D)之合計相對於成分(B)之質量比[(C)＋(D)]/(B)為1.0以上且3.5以下，成分(D)相對於成分(C)之質量比(D)/(C)為1.2以上且2.2以下。 (A)過氧化氫 (B)非離子界面活性劑 (C)高級醇 (D)烴
