Wet hair will fade color quickly and so as the manic panic purple haze on dark hair. Purple shampoo does not affect dark hair. Joico Color Endure Violet Shampoo Review Toner for Now, do you want to know in what cases purple shampoo does work on dark hair? Purple shampoo on dark hair . Purple shampoo is not a hair dye. To properly use purple shampoo, coat your hair from root to end, and let it sit. Can you use purple shampoo on brown hair? The perfect brunette is a toning shampoo, which helps you get your dark hair back to the luscious, rich shade it deserves to have. Keeping it looking pretty, super bright and free from brass is not easy. A powerful purple shampoo with enough pigment to actually correct brassy and yellow tones, this leaves behind the perfect icy color, says celebrity stylist rikki gash. Too many have no idea how to use it right. Those of us with blonde hair need purple shampoo because of how the hair is lightened in the first place. Inspired from ...