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You may not have worn a mood ring in quite a few years, but colour-changing beauty products are definitely on the rise, especially in the lip category. These balms adjust to the pH and temperature of the wearer, giving you a custom, flattering colour. Beauty shelves are stocked with these magical goodies, which are often fun and more hydrating alternatives to heavier liquid lipsticks and matte formulas. Ahead, you'll find some of the best and most stunning varieties on the market that bring a rainbow of hues to your lips.