Added oil in Garnier Olia 4.15 Iced Chocolate Hair Dye maximises the colour result, leaving hair smooth and glossy. Garnier Olia 4. 15 Iced Chocolate Hair Dye is an ammonia free formula and powered by 60% oils. The hair colour visibly improves the quality of hair, for better shine and 35% smoother hair. Olia home hair colour will also pr maximum colour performance for lavish, vivid and long-lasting colour. Plus, a unique sensorial application and optimal scalp comfort with our non-drip smooth velvety texture of the colourant cream.