The colour that changes everything with ME+ technology. Pure, balanced colour results with natural depth and shine. ME+ reduces the risk of developing a new allergy to hair colour for people not allergic to hair colourants. Although the risk of developing a new allergy is reduced, there remains a risk of allergic reaction that can be severe. Always ask your stylist to perform an allergy alert test 48 hours before each colouration. ME+ is present in specific shades of Pure Naturals, Rich Naturals, Vibrant Reds, Special Blondes, and Deep Browns of the Koleston Perfect brand.