Wella Koleston Perfect ME+ 6/1 Dark Blonde Ash Rich Naturals 2 Ounce 60 Gram Koleston Perfect Me+ uses breakthrough Me+ technology. Designed to replace extreme sensitisers PPD and PTD this new color molecule helps to reduce the risk of developing a new allergy to hair colour by up to 60 times. Alongside Pure Balance Technology which actively reduces free radicals and provides even better protection for the hair bonds during the colouring process the updated formula promises reduced breakage even colour results with balanced natural depth long-lasting true-to-tone colour and higher longer lasting shine all with 100% grey coverage! Use 4% Welloxon Developer