The color you can trust: Formulated with ME+ dye technology to reduce the risk of developing a new hair color allergy. With ultra-precision color technology it provides pure, balanced color results with natural depth and shine. Up to 100% gray coverage. Formulated with Metal Purifier. Helps prevent hair damage caused by metals. Your best ally to obtain ultra-precise color results and maintain healthy-looking hair color after color. It is not necessary to use a pretreatment to neutralize the metal when coloring with Koleston Perfect. Dermatologically tested. Vegan. Instructions for use - Simple mixing ratio 1:1 - Up to 5 levels of clarification.