
You get to a certain age, and if you’re remotely vain (and let’s face it, you are), you need to have your hair colored fairly frequently. You’re hardly alone. Roughly 75 percent of women in the United States color their hair, which today adds up to an $18 billion opportunity for brands like L’Oréal and Clairol. It used to look that way, anyway. Eating into a…
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