The colour has been developed 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 already 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 prior to any colouring Carefully follow the safety instructions English language not guaranteed If you have already experienced allergic reactions to hair dye in the past you should not colour your hair Less hair damage with each use compared to previous version of Koleston Perfect Applies to Koleston Perfect with Pure Balance technology