The present disclosure relates to a cosmetic agent for blonding human hair comprising (i) a package comprising at least one multilayer film comprising at least one metal-containing layer as a barrier layer, and (ii) a bleaching agent composition contained in the package, the bleaching agent composition containing at least one percarbonate and at least one inorganic salt of a peroxosulfuric acid. Furthermore, the present disclosure relates to a method for blonding human hair.
