COLLECTION: ProYou / Coloured and streaked hair needs specific ranges to prolong colour, maintain shine and softness. Revlon Proyou The Keeper shampoo gently cleanses the hair shaft and protects the colour from the first application. Its formula prevents colour fading, protects the hair shaft and maintains shine. Its pH ranges from 4.5 - 5.5, respecting the pH of the skin, so it can be used frequently. The A.R.T SYSTEM technology meets the specific needs of each hair to achieve the best results.