Check the listing for details. Wella Welloxon KP Crème Developer 6% 20 Volume, 33.8 oz. Color: N/A, Condition: New with box. Listed at 19.99 USD. Wella Welloxon KP Crème Developer 6% 20 Volume, 33.8 oz Wella Koleston Perfect, the brand of choice for hair color in over 100,000 salons worldwide. Up to 100% gray coverage with roots to tip evenness and contain 25% conditioning agents and lipids for care and gently on hair. Truly perfect, intense, and vibrant color results from the highest quality ingredients. Mixing Directions: Combine with Koleston Perfect Creme Developer for outstanding, high-density results. Koleston Perfect Base & Koleston Perfect Creme Developer (1:1). Special Blonde shades ratio (1:2). Mixing Ratio: 3 levels of lift: 1 part Koleston Perfect, 1 part Koleston Perfect Creme Developer 12% 2 levels of lift: 1 part Koleston Perfect, 1 part Koleston Perfect Creme Developer 9% 1 level of lift/Coverage of gray/white same depth or darker: 1 part Koleston Perfect, 1 part Koleston Perfect Creme Developer 6% Special Blonde: 1 part Koleston Perfect, 2 parts Koleston Perfect Creme Developer 9% or 12% Application: Full-head color, first-time application: Dampen the hair. Distribute the color from roots to ends and evenly comb through. Development time: - HEAT: 30“40 min / + HEAT