Click to expand Tap to zoom Wella Koleston Perfect - 6/97 Dark Blonde Cendre Brown 60g by Wella Save 0% Save % Please register or login to view prices. SKU 99240007698 Koleston Perfect is the first professional hair color brand to feature breakthrough technologies boasting pure, balanced color results with natural depth and shine. Simple 1:1 mixing ratio. Up to 100% grey coverage. Up to 5 levels of lift.