12 reasons to love your blonde, grey and highlighted hair. 12 Reasons Purple Shampoo rids hair of unwanted yellow and brass tones, while boosting essential hydration and nourishment. The transformational ability of 12 Reasons: Cleanse, detangle, colour protection, rich nourishment, anti-frizz, eliminate product build-up, deeply moisturise, add brilliant shine, smooth, nurture dry and damaged hair, improve manageability and won’t weigh hair down.