Slightly too late for Halloween, but something to maybe keep in mind for next year's party--
Quinine, the active ingredient in tonic water (as in gin and; the stuff that wards off malaria), fluoresces under ultraviolet light. That means that if you use tonic water instead of regular water to make Jello, the result will glow under a black light source. Spoooky.
Extra science-y note-- apparently the level of fluorescence may change according to the pH level of the final solution, so if you try this you may wish to experiment with different additives and flavorings to find the glowiest results. Relatively neutral balance appears to be ideal.
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