Click to expand Tap to zoom Wella Koleston Perfect - 9/16 Very Light Blonde Ash Violet 60g by Wella Save 0% Save % Please register or login to view prices. SKU 8116625 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.