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The ideal partner for wella permanent colours and lighteners. Available in different volume for all the services possibilities (1.9%, 4%, 6%, 9% and 12%). Specifically reformulated to achieve the most accurate colour, redesigned to provide optimal consistency with new Koleston Perfect. Easier and faster mixing, precise application, great foil adhesion, easy rinsing and a comfortable client experience. The 12% Welloxon Perfect 40 volume hair developer is created to achieve the best color results. It lifts the hair by four levels. Optimal consistency with new Koleston Perfect Easier and faster mixing Precise application The Welloxon perfect developer offers great foil adhesion for an easier colouring experience Easy rinsing A comfortable client experience Click here to see more from Wella