Into the Woods
Looking forward to fall's golden, crimson, and russet hues, stylist Thomas Hintermeier thinks the best single-process shades mimic nature. For brunettes wanting more drama, he suggests adding a warm auburn tone: "When you go in the sunlight, you'll have a vibrant red shimmer."
The longer your hair, the more weathered the ends are. By adding pigment (instead of bleaching it out), a single process smooths damaged cuticles so hair seems shinier and healthier. But steer clear of burgundy, says Hintermeier. "Bluish-red hair doesn't exist in nature—try gold undertones instead."