Olia by Garnier Naturally is our first Oil powered and Ammonia free hair colour at home! Experience an exceptional colour and a visible improvement of hair quality in a variety of shades. Choosing your perfect shade: Hair colour result will vary depending on your natural colour. If you are deciding between 2 shades, we recommend to always choose the lightest. The Colour Result: On grey hair, colour will appear lighter than on non-grey hair. Test for allergies 48 hours before use