The present invention relates to a cosmetic agent for dyeing, in particular for lightening keratin fibers, in particular human hair, including at least one specific aminated silicone polymer and at least one oxidation dye intermediate and/or one direct dye, wherein the use of the at least one aminated silicone polymer leads to improved care of the keratin fibers with improved hair lightening performance. The invention further relates to a corresponding packaging unit (kit of parts) and to a method for dyeing, in particular lightening, of keratin fibers. Lastly, the invention relates to the use of the cosmetic agent according to the invention and the use of a packaging unit for producing an oxidative hair lightener for care of keratin fibers with improved lightening performance.
