Question: ion hair color how much developer?
Answer: Using a non-metallic bowl or tint bottle, mix 2 oz of Ion® Color Brilliance™ with 2 oz Ion Sensitive Scalp® Crème Developer. For High Lift Blondes mix 2 oz of color with 4 oz 30 or 40 volume Ion Sensiti1ve Scalp® Crème Developer. Use a tint brush or tint bottle to apply the mixture to dry unwashed hair.