Salerm White Hair Shampoo is a specific shampoo for the treatment of gray and white hair as it eliminates yellow tones and brassy tones to leave hair looking shiny and bright and in excellent condition. Its formula contains a combination of violet toned semi-permanent colorants that guaranty the progressive elimination of the yellow coloring of gray hair. How to Use Wet the hair. Apply the required amount of White Hair Shampoo and massage gently. Leave to work for 5 minutes. Rinse and proceed as usual.