Fluorescence and phosphorescence are both examples of photoluminescence. In both cases, light is absorbed and then re-emitted at a less-energetic wavelength. Fluorescent and phosphorescent objects usually glow under exposure to ultraviolet light (though this is not a requirement). Fluorescence involves absorbing and releasing lower energy light almost immediately, while the light release of phosphorescence is delayed, so these materials appear to glow in the dark.
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 Black Light |  Phosphorescence Example |  Tonic Water Fluorescence |  Glowing Fluorescent Dye |
 Fluorescent Minerals |  Fluorescent Minerals Key |  Glowing Magic Powerballs |
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