This tinted hair colour treatment is ideal for all hair types and suits both coloured and non-coloured hair. O&M clean tone helps to keep your hair colour looking fresh, nourished and shiny like you have just visited your colourist. Cool blonde treatment is recommended to help maintain cool ash tones on blonde to very light blonde hair whilst helping to eliminate unwanted yellow or brassy tones. It can also be used on lightened and natural white/grey hair.