If you recently used a temporary or semi-permanent hair dye and aren’t thrilled with the results — or maybe you’ve wound up with a greenish tint from swimming in chlorine — certain clarifying shampoos ...

My hair is currently a gingery red. A week ago it was a deep chestnut brown. Before that, blue-black. Last year? Blonde, pink, blue, purple, and back to blonde. No, my hair hasn’t fallen out, but that ...