After a flirtation with auburn hair color in high school and some serious bleach in college, I went au naturale. But recently, the few-and-far-between white hairs that I began to pluck in my mid-30s are now threatening to become a bald spot if I keep up the practice. It’s time for natural hair color. Natural hair colors typically eschew coal tar, peroxide, benzene, ammonia, toluene, paraphenylenediamine and other toxic chemicals omnipresent in conventional hair dyes—things that I most definitely want to avoid. Even the FDA warns that conventional hair dyes can cause respiratory problems, hair loss and skin irritation—among other problems.