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RedshiftSinger t1_jdtzyhh wrote

Reply to comment by Omw2fym in Filled my glass with tap water that looks light blue after drinking a glass of red wine by missmimi1011

This also happens with naturally occurring anthocyanins in plants, and grapes are one of the plants that produce anthocyanin pigments. It’s just a reaction to a different pH.

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missmimi1011 OP t1_jdu1f26 wrote

This makes me feel better!! Lol!

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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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spekt50 t1_jduqikz wrote

I noticed this when making blackberry jelly. My tap water has a high pH and the blackberry juice would turn bright blue when diluted with tap water.

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