I am an essential when Colouring because I activate the Hair Colour when you mix us together. I'm super strong, strong enough to Lighten your Natural Hair Colour 4 Shades so I'm ready for a serious Hair Colour transformation. I am strong enough to take your Hair from 3 Dark Brown to 7.3 Golden Blonde or 5 Light Brown to 9.1 Light Ash Blonde or 6 Dark Blonde to 902 Extra Light Beige Blonde. I'm also designed to use with to really give your Hair Colour that proper lift.