Tuch Of Silver Brightening Shampoo neutralises brassy tones, for visibly brighter hair in just one wash. Pro:Voke Touch Of Silver Brightening Shampoo is formulated with a unique mix of violet & blue pigments, this purple shampoo restores your hair colour by counteracting orange and yellow tones, whilst optical brighteners add shine. Blonde, Platinum, Grey or White Hair. Toning purple shampoo to neutralise brassy tones in just one wash. Touch Of Silver Brightening Shampoo actively neutralise brassy, yellow tones and treat colour fading and dullness for instant, visible results.