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- Wella Professional's Koleston Perfect range is one of the best for permanent hair colour. Now get the purest results with their new and improved formula available in an incredible 160 shades. With up to 5 levels of lift, hair will be transformed with its natural depth and shine intact. What makes this formula better than previous iterations is its ME+ technology, which reduces the risk of allergic reactions during application. As a flexible cream designed for a quick and easy 1:1 ratio mix, it now promises a smooth application that will stay in place on the hair. Get the ultimate salon colour now by combining Koleston Perfect Colour with the Wella Welloxon Perfect Developer. Combine Koleston Perfect hair colour with Welloxon Perfect for outstanding, high-density results. Simple 1:1 mixing ratio. For example: 60 ml Koleston Perfect + 60 ml Welloxon Perfect. Mixing ratio:3 levels of lift: 1 part Koleston Perfect, 1 part Welloxon Perfect 12%2 levels of lift: 1 part Koleston Perfect, 1 part Welloxon Perfect 9%1 level of lift/coverage of grey/white same depth or darker: 1 part Koleston Perfect, 1 part Welloxon Perfect 6%Apply the hair colouring mixture immediately, from roots to ends. Caution: Hair colour can cause severe allergic reactions so please always complete a patch test before using and follow the product instructions. For more Wella allergy advice, please check out their Allergy Alert Test Summary & Questionnaire.