4 ms·

Quinine is another fluorescent substance - it glows blue in UV light. I used to carry a UV diode into malls to test if tonics contained quinine.

• cialowicz 4y ago
  Curious, was this a hobby or did you work for the government tonic inspection bureau?
  • hinkley 4y ago
    All gin drinkers are members of the tonic inspection bureau.
    • UmYeahNo 4y ago
      Gin drinkers, too
      • hinkley 4y ago
        Err, yes.
• lostlogin 4y ago
  What did you find? I believe most use a synthetic version. I’ve only had the natural one a few times and it was quite different, but the drink wasn’t as sweetened so that might have been the difference.