The colour is made with ME technology Perfect even and modern colour results Me reduces the risk of developing a new allergy to hair colour for people who are not allergic to hair dyes Although the risk of developing new allergies is reduced there is still a risk of allergic reactions which can sometimes be severe Perform an allergy test 48 hours before any colouring Carefully follow the safety instructions If you have already experienced allergic reactions to hair dye in the past you should not colour ME is contained in certain nuances of Koleston Perfect brands Pure Naturals Rich Naturals Vibrant Reds Special Blondes and Deep Browns Less hair damage with each use compared to previous Koleston Perfect Valid for Koleston Perfect with Pure Balance technology