12Reasons Purple Shampoo 400ml12 reasons to love your blonde, grey and highlighted hair. 12Reasons Purple Shampoo rids hair of unwanted yellow and brass tones, while boosting essential hydration and nourishment. The transformational ability of 12Reasons: 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.