L'Oréal Professionnel Série Expert Chroma Creme Purple Shampoo 1500ml. Chroma Crème is the outcome of a unique collaboration between L'Oréal Professionnel Paris colour Labs and Haircare Labs. Together, they have developed an exclusive technology combining professional tailored dyes to neutralize unwanted warm reflects, now in our most caring formula. How to use: use Purple Chroma Crème in alteration with your regular shampoo and adapt the leave-on time depending on desired degree of neutralization, from 2 to 5 minutes.