In a perfect travel size, this violet-hued shampoo tones & maintains blonde or grey hair by neutralising brassy or yellow tones. The formula gently cleanses hair whilst depositing violet dye upon the hair strands which then work to brighten highlighted, bleached or grey hair that has yellowed due to oxidation, making it perfect not only for correcting brassy hair but also maintaining cool, ash colours. How to use: You may choose to alternate this shampoo with the regular Color Endure shampoo or a more moisturising/balancing formla to meet your hairs needs.