Garnier's Olia This is, of course, our first at-home oil-powered and ammonia-free hair color! Enjoy a remarkable color and a noticeable enhancement in the quality of your hair in a range of tones. Selecting the ideal shade for you: The outcome of your hair color will differ based on your natural color. Picking the lighter shade is always advised when choosing between two. The color outcome Color will appear lighter on grey hair than it does on non-grey hair. Check for allergies 48 hours prior to usage