What it is:
Wella - Koleston Perfect 30 Volume 9% Cream Developer.
What it does:
Provides a color protecting barrier on the hair fiber, resulting in a longer retention of color.
What else you need to know:
Mix Koleston Perfect Creme with Koleston Perfect Developer to guarantee best color results. For Koleston Perfect the ratio of developer is 1 to 1. These tubes are 2oz. therefore you use 2oz. of developer per tube ....So for 1 ounce color you need 1 ounce developer.