Banishing unwanted yellow or brassy tones for cool, ashy colour! Having yellow hair shows how unhealthy your hair is. Treat and cover them using the Brass-Corrector Violet Shampoo! The Brass-Corrector Violet Shampoo is formulated to get your hair back to its brilliant and shimmering silver tones with revitalized color. It corrects brassiness and yellow tones while brightening natural highlights for a softer, shinier and healthier hair.