Family Life Do you add developer to Ion permanent hair dye? Do you add developer to Ion permanent hair dye? Apply on pre-lightened or highlighted hair, 1:1 mixing ratio. Two ounces of color to two ounces of 10 Volume ion Sensitive Scalp Creme Developer. Bowl and brush application is recommended. ... Work gently through hair as you would a shampoo. Related Posts:What developer do I use with ion permanent brights?What happens if I use ion permanent brights without developer?How to know how much developer to use?How to Remove Lint from a Hairbrush is the most effective way to do it.