Wella Permanent Koleston Perfect Me+ is the first and only professional hair colour brand to feature breakthrough technologies, Pure Balance Technology and ME+, both proven to deliver vibrant rich colour with less damage colour after colouring, while ME+ reduces the risk of developing a new allergy to hair colour. Koleston Perfect ME+ is a permanent colour range which works perfectly when used with Wella new Welloxen developers 1.9%, 4%, 6%, 9% and 12%.