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