Garnier Olia 9 1/2.1 – Lightest Cool Blonde baks Garnier June 9, 2015 Garnier Olia 9 1/2.1 – Lightest Cool Blonde : A very pale yellow. Such as platinum hair color. The dark yellow or light brown hair? You can use this hair dye. Medium yellow color as you get in the first photo. I added a video. 9 1/2.1