Skip the suds: It makes sense. Washing hair washes out color too. One way the Beauty Lab tests color fading is by repeating washing cycles, because just plain water (not to mention shampoo's surfactants) can leach dye molecules from strands, the Lab explains. "Wash colored hair every other day at most," Hill says. Switch products regularly : The Beauty Lab has found that using a color_depositing shampoo, conditioner or hair_gloss treatment once a week between dye jobs can revitalize hair color. Try Seal holders Pantene Pro_V Brunette and Highlighting Expressions Shampoo and Conditioners. Gloss it up: Like lip glosses for strands, hair glosses leave a hue_boosting hint of color and shine.
Section, section, section. To avoid patchiness, create a middle part that runs to the back of your head and split the hair into four sections two in front of the ears and two in back. "Always apply the dye from back to front," says colorist Aura Friedman, of the Sally Hershberger Downtown salon in New York City. "That way the dye is sitting on the back of your hair the longest, which is naturally darker than the front anyway."