A packaging unit (kit of parts) for dyeing keratin fibers and related methods. The packaging unit includes, formulated separately from one another, at least one container (C1), comprising a cosmetic agent (M1), which comprises at least one compound, selected from oxidation dye precursors, direct dyes and the mixtures thereof, and at least one aminated silicone polymer, comprising at least one structural unit of formula (I) and at least one structural unit of formula (II)where a denotes a linear or branched C4 to C8 alkyl group； and n denotes integers from 1 to 4. The kit further comprises at least one container (C2) including an oxidizing agent preparation (M2), which, in a cosmetically compatible carrier, comprises at least one oxidizing agent in a total amount of 0.5 to 15 wt. % based on the total weight of the oxidizing agent preparation.
