Lightener

The invention relates to an agent for lightening human hair based on at least one solid peroxo compound and at least one solid alkaline support and characterized in that said agent is available as a powder or paste containing 0.1 to 25 wt. % of a compound of formula (I) to (III), whereby radicals R to R independently stand for hydrogen, branched or unbranched C1- to C22-alkyl groups, branched or unbranched, mono-unsaturated or poly-unsatured C1- to C22-alkyl groups, branched or unbranched C1- to C22-hydroalkyl groups or substituents of formula (IVa), (IVb) or (V), whereby r, s, u and v can independently vary from 0 to 6, w can be a whole number from 1 to 4 and R can be a branched or unbranched, saturated mono-unsaturated or poly-unsaturated C1- to C4-alkyl group, X is an anion of a physiologically compatible inorganic or organic acid, n is a whole number and y is a whole number from 1 to 6, with the proviso that at least one of the radicals R to R in the compounds of formula (I) must contain a C1- to C22 chain, at least one of the radicals R to R in the compounds of formula (II) is selected from the substituents of formulae (IVa) or (IVb) and the melting point of compounds of formula (I) to (III) is below 60 DEG C.