What It Is Color depositing purple shampoo for neutralizing warmth and correcting yellow tones in blonde and grey hair. What It Does So Silver Shampoo is a color depositing purple shampoo that cleanses and neutralizes unwanted brassy warmth and eliminates dull, yellow tones in blonde and grey hair. So Silver illuminates highlights on blondes and adds shimmering brightness for color treated and natural hair ranging from grey to white shades.