To get quality color coverage, the kind that can turn back the clock, usually takes a color specialist on-site at a hair salon—or, the kind you get with eSalon.com, according to the company. “We assign every customer their own color specialist to consult with,” explains Estelle Baumhauer, eSalon’s color director with over 17 years experience teaching color techniques in top salons from Los Angeles to New York to Paris. “Either online or on the phone, we’re here to discuss your graying hair a...