1. Lighten first: Primary tones look muddy unless you start with a pale base. Dab your hairline with petroleum jelly and use rubber gloves to prevent staining. Follow dye instructions for processing, but remove color after an hour to prevent damage. A semi-permanent formula like Manic Panic Semi-permanent Hair Color Cream ($10 each; rickysnyc.com) works best.
2. Detox with a rich conditioner, preferably one packed with protein like Motions Deep Penetrating Treatment ($5; drugstore.com).