A multi-component packaging unit and related method for the reductive decolorization of colored keratinic fibers comprising, packaged separately from one another,(I) a container (A) containing a cosmetic agent (a),(II) a container (B) containing a cosmetic agent (b), and(III) a container (C) containing a cosmetic, aqueous agent (c), with the agent (b) in container (B) containing (a1) one or more reducing agents from the group of sodium dithionite, zinc dithionite, potassium dithionite, sodium sulfite, sodium hydrogen sulfite, potassium sulfite, potassium hydrogen sulfite, ammonium sulfite, sodium thiosulfate, potassium thio sulfate, ammonium thio sulfate, hydroxymethane sulfinic acid, aminomethane sulfinic acid, cysteine, thiolactic acid, sulfanylacetic acid (thioglycolic acid) and/or ascorbic acid, andagent (c) in container (C) including (c1) one or more acids from the group of the inorganic and/or organic acids and(c2) one or more zwitterionic and/or amphoteric surfactants.
