Frederick M. Brown/Getty Images, James Devaney/WireImage, Courtesy Clairol
Go Redder Like Rihanna
Clairol Beautiful Collection Burgundy Brown ($7; at sallybeauty.com
Fragile or chemically straightened hair calls for a gentle formula, like a semipermanent color that contains no ammonia or peroxide. For extra protection, do a deep-conditioning treatment before applying the formula.