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Choose permanent color. You can go darker or lighter and cover gray, but try not to stray too far from your natural shade. "You don't want to get stuck with a dramatic change that you dislike," explains Michael Canale, a colorist and salon owner in Los Angeles.
Try Avon Advance Techniques Professional Hair Color ($8, avon.com)
Make It Last
Permanent color can change over time. "Use shampoos and conditioners designed to offset brassiness," says Marie Robinson, the owner of an eponymous salon in New York City. Look for green or blue pigments in the ingredients list: We like Pantene Pro-V Brunette Expressions Shampoo ($5, drugstores).