US Patent 7147668 Hair bleach

An oxidative hair bleach comprising a first pack with an alkalizing agent contained therein and a second pack with an oxidizing agent contained therein, wherein the oxidative hair bleach comprises the following ingredients (A), (B), (C), (D) and (E) in the following proportions in a whole composition after mixing the first pack and the second pack together, and has a pH of from 8 to 12:(A) a water-miscible organic solvent having an octanol-water distribution coefficient (log P) at 25° C. of 0.3 or greater and a molecular weight of 200 or lower: 8 to 40 wt. %;(B) the alkalizing agent: 0.1 to 10 wt. %;(C) the oxidizing agent: 0.1 to 12 wt. % as calculated in terms of hydrogen peroxide;(D) water: 25 to 70 wt. % and(E) an anionic surfactant or ampholytic surfactant in a proportion of 60 wt. % or less in said whole composition after mixing said first pack and said second pack together.This hair bleach has excellent bleaching power and can color hair into a light tone and a good shade, and has a reduced irritating odor and is low in irritation to the scalp.