Wella Koleston Perfect is a permanent hair color cream specifically designed for professional use. It has a simple 1:1 mixing ratio and provides up to 100% grey coverage with the potential to lift up to 5 levels. The color results are pure, balanced, and offer natural depth and shine to the hair. The innovative ME+ TM formula minimizes damage with each use and reduces the risk of developing new allergies to hair color. However, it is important to note that this product may contain ingredients that could cause skin irritation. As a precaution, a preliminary test should be performed according to the accompanying directions before use.