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Grab a glaze that heightens sheen but doesn't alter or add color. To aid absorption and boost the effects, wrap a warm towel around your strands for 20 to 30 minutes before rinsing, suggests Mike Petrizzi, a colorist for De Berardinis Salon in New York City.
Try Rita Hazan Foaming Gloss in Ultimate Shine ($26, Sephora stores)
Make It Last
End every shower with a cold rinse. "This makes the cuticle layer lie flat, so hair is more reflective," Petrizzi says. "And skip one shampoo a week to preserve luster."