An oxidizing agent preparation for treating keratinic fibers, in particular human hair, includes in a cosmetic carrier (a) 0.01 to 25.0 wt. % of hydrogen peroxide, (b) 0.01 to 15.0 wt. % of one or more organic lipophilic compound(s) from the group of plant and animal fats, oils and waxes, paraffin hydrocarbons, C10-C24 fatty alcohols, silicone oils and dialkyl ethers of formula (I), in which R1 and R2 mutually independently denote an unbranched or branched C8-C24 alkyl group, and (c) 0.01 to 2.00 wt. % of one or more organic thickeners from the group of polysaccharides with the proviso that the oxidizing agent preparation does not include any synthetic polymers of the polyacrylic acid type. R1-O&mdash；R2&emsp；&emsp；(I).
