FIELD: cosmetology. SUBSTANCE: cosmetic composition contains peroxy derivatives as oxidant, and at least one anhydrous linear block copolymer and/or static copolymer of polyethyleneoxide/polypropyleneoxide type which is liquid and water soluble at room temperature. Method involves mixing of decolorizing powder based on peroxy derivatives in the presence of copolymer(s), coagulants, pH regulator and cosmetic additives with block copolymer and/or static copolymer. EFFECT: higher cosmetic properties; improved decolorization of hair. 10 cl, 1 tbl, 3 expm
