Goldwell Topchic will guarantee even, bold, intense colour with optimum results across the range with 100% grey coverage. For professional use only The Coenzyme Technology helps to create a smooth, flawless finish meaning your hair is protected from external impurities. The built in equaliser system will help create even colour results from root to tip. This is the first professional colourant product to have CoolProtect Technology which enables the colour to stay cool over time increasing durability.