Meet our newest hair color crush: Opal. It's the softer, whimsical cousin of the rainbow trend that is perfect for transitioning into winter. Using a gray base with shades of green, yellow, pink, blue and lavender, the result is holographic resembling the semi-precious gemstone. Try it in pastel for a subtler unicorn look, or in bold neon colors to pump up the glow effect. See which ones are fueling our opal obsession below.
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