Color Wow Color Control Foam is lightly tinted lavender . For anyone who is naturally, colour treated blondes such as highlights. Or white hair, grey hair and any fair hair shades that turn yellowy or brassy, anyone who uses purple shampoo. The Colour Control Foam instantly helps neutralise brassy or yellow tones. Unlike purple shampoos that leave stains on the scalp, this fam is much easier to use. A quantum leap from the sticky, old fashioned mousse that makes your hair stiff and crispy, this “smart foam” use “rosin” (a natural, ribber-like substance derived from trees) and not the typical “resins” (stiff, acrylic polymers) to give your hair soft, flexible texture to make styling easier and protect against breakage. alcohol free, no sulphates, cruelty free, gluten free and vegan friendly.