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missmimi1011 OP t1_jdu1f26 wrote

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kjhvm t1_jdul13s wrote

Yup, many anthocyanins turn blue at pH 8 and above. Some also turn green. A few drips of wine in alkaline water and there you go! You can test it by slowly adding lemon juice or vinegar and watch the color go back the other direction to reddish hues.

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