MUST-HAVE KIT Fekkai Salon Color 8R Light Auburn-Eva ($30; ulta.com).
PRO TIP The risk for taking brunet hair redder is that purple undertones can appear. To avoid this, “go for shades that are more copper and gold,” says Lorri Goddard-Clark, a colorist at the Neil George Salon in Los Angeles. “You’ll get the fiery effect without any berrylike tint.”Read MoreLess
Go Lighter, Darker, Redder! Find Your Perfect Celebrity Shade