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Long-lasting colour: for brilliant, even colour results with exceptional durability and radiant shine. ME+ colour technology: reduces the risk of developing a new hair dye allergy* – with uncompromising colour performance. *For people without known allergy to hair colour." METAL PURIFIER TECHNOLOGY: Neutralises metals in the hair from tap water – for purer colour results and a reduced risk of hair damage. Easy to use: 1:1 mixing ratio with Welloxon Perfect - for smooth consistency and precise application. 100% GREY COVERAGE: completely covers grey hair and brightens natural hair by up to 3 tones - ideal for professional results. Wella Professionals; Wella permanent hair dye; Wella Koleston; Wella Koleston Perfect; Wella Professionals permanent hair colour; Wella Koleston colour; Koleston Perfect; Koleston, permanent hair dye; professional hair colour; permanent colour; hair dye; permanent hair colour cream; durable hair colour; highlights; grey coverage; metal purifier technology; Me+ colour technology