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As Paul mentions, tonic water works as a UV light "detector".  The surface of the tonic water glows with a blue light.  I have done this one successfully.  One suggestion - put a black background (fabric or construction paper both work well) behind the
glass containing the tonic water.  Without it, the blue light doesn't show up as well since the ambient light & sunlight tend to make the fainter blue light harder to see.

Have fun!

Michelle

Michelle Nichols, Master Educator - NASA Forum Programs
The Adler Planetarium
1300 S. Lake Shore Dr.
Chicago, IL  60605
312-322-0520 
312-322-2257 (fax)
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http://www.adlerplanetarium.org


Visit our website: http://www.adlerplanetarium.org


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