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Clairol Perfect 10 by Nice 'N Easy ($14; at drugstores) tints your locks in 10 minutes flat–versus the 20 to 30 minutes required by most do–it–yourself color kits. Its secret: The additive amino glycine makes the color pigments sink into your strands faster than those in traditional dyes. But the benefits don't end there. The formula is also ammonia free, so there's no chemical odor, and the applicator has a comb on top to make dye distribution a cinch.