| abstract |
The present patent application relates to a process for bleaching keratin fibers which is characterized by applying to the fiber a ready-to-use agent having a basic pH and containing a) at least one bleach booster according to the general formula (I) wherein R1 is a hydrogen, R2 is hydrogen, a substituted or unsubstituted C1- to C12-alkyl group, a substituted or unsubstituted C1- to C12-monohydroxy-alkyl group, a substituted or unsubstituted C2- to C12-polyhydroxy alkyl group, or a substituted saturated, unsaturated or aromatic 4- to 8-membered carbocycle or heterocycle, and R3 is a OR-Group, with R being equal to hydrogen, an ammonium group or an alkali metal or an earth alkali metal atom; and b) at least one appropriate type-2 bleach-stable direct dye and c) at least one oxidant; and after an exposure time of 5 to 60 minutes at a temperature of 10 to 70 DEG C rinsing the fiber with water; as well as the use of special type-2 bleach-stable direct dyes for acquiring a natural looking bleaching of keratin fibers, particularly human hair, without undesired undertones. |