Essentials by Matrix So Silver Shampoo 13.5 oz To Use: Wear suitable gloves, apply to wet hair, lather and rinse well. Repeat if necessary. For Maximum results, leaves second lather on 3-5 minutes. New name- Matrix Essentials Solutionist So Silver Shampoo. Eliminates dulling yellow tones and adds shimmering brightness to grey and white hair. Neutralizes unwanted brassy tones and enhances natural highlights on blonde, frosted and bleached hair.