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Because the color particles in red dye are bigger and are more prone to slide out of the hair follicle, crimson hair washes out faster than other shades. Celebrity hairstylist Rodney Cutler, who works with Emma Watson, suggests using Redken's Color Extend Shampoo and Conditioner ($14 and 15; redken.com for locations) to protect your hair from minerals in tap water that accelerate fading.

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