The Reason Tonic Water Glows in the Dark


If you were to look at a gin and tonic (or vodka and tonic, or anything with tonic, for that matter) under ultraviolet light, you might be surprised to see it glow — and you might naturally wonder what produces the eerie effect.

The answer is surprisingly simple: Tonic water actually contains the chemical quinine, which fluoresces under certain light and makes tonic water glow.


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