Garnier Olia 10.1 Very Light Ash Blonde Hair Dye provides you with a bold and vibrant colour that covers up to 100% grey coverage. Garnier Olia 10. 1 Very Light Ash Blonde Hair Dye is an ammonia free dye that is powered by 60% oils and leaves a pleasant smell. This kit is easy to use in the comfort of your home and gives you a unique sensorial application and optimal scalp comfort thanks to the non-drip smooth velvety texture of the colourant cream. Your hair will be visibly improved giving you better shine and smoother hair with long lasting colour. You must do a skin allergy test without fail 48 hours before each use of this product.