Masque Ultra-Violet is a rich deep purple hair mask that neutralizes brassiness & unwanted yellow tones while deeply nourishing & restoring sensitized, lightened hair. Keeps your blonde hair cool longer. Contains Hyaluronic Acid and Edelweiss flower to smooth, strengthen, and soften sensitized lightened hair, protecting it from daily oxidation and pollution particles. This toner for blonde hair leaves cool blonde hair bright and shiny. Can be used on a weekly basis, or at the advice of your hairdresser.