There's magic in them thar tea leaves.
Actually, there's probably anthocyanin.
The video up there comes from a Bon Appetit post about butterfly pea flower tea and the cocktails made from it. The article doesn't go into the science because it's a cooking mag after all.
The science, however, is pretty frickin' fascinating. Anthocyanins can hit a half dozen different colors - red, yellow, green, blue, pink, purple - depending on the pH of the solution.
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