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Unicorns, take note! Metallic hair couldn't be more fresh, especially as summer winds to a close. If you're raring for a change as we start to segue into cooler temperatures, know this: This trend lends a whole new kind of edge to rainbow and unicorn hair.

Metallic hair brings together muted pastels in a glorious and multidimensional rainbow of colors that are as versatile as they are chic. So bring on those ashy tones! You're going to love these thrillingly electric shades. (Image via Pinterest.)