Koleston Perfect is a permanent color range used with Welloxon Perfect developers NEW 4%, 6%, 9%, 12% and 1.9% Welloxon Perfect Pastel for pastel toning. Mix 60g Koleston Perfect Colorant + 60ml Welloxon Perfect Developer mean Mix 1:1. Use 12% Welloxon Perfect for 3 levels of lift, Use 9% Welloxon Perfect for 2 levels of lift , Use 6% Welloxon Perfect for 1 level of lift, coverage of gray hair, working on the same depth or darker Use 4% Welloxon Perfect working on the same depth or darker, to achieve deeper results on natural hair with no gray hair coverage required.