What is it: Tinted Hair Colour Treatment Best for: Coloured or 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. CARAMEL Recommended to help maintain warmth and richness on blonde to very light blonde hair. Recommended on hair colour levels 7-9. Apply to washed and towel-dried hair using gloves. Massage onto lengths and ends. Leave in for 3 minutes for light tone results or longer (up to 10 minutes) for stronger tone results. Rinse thoroughly until water runs clear.