"One of the most distinctive characteristics of butterfly pea flower tea, and other drinks that use butterfly pea flower extract, is that it will change color when the pH balance changes. A deep blue tea will turn purple with the addition of lemon juice, turning a deeper shade of purple the more lemon juice is added.[5][6] Mixed with fuchsia roselle hibiscus leaves the tea will turn a bright red color.[1][6]"
https://en.wikipedia.org/wiki/Butterfly_pea_flower_tea
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