What is the naturally luminescent material in the polyester thread and the snaps in your glow-in-the-dark diapers? Does it come from an animal, a vegetable, or a mineral?
Mineral. There are many non-radioactive mineral activators of fluorescence. These are added to polymers as dyes or fillers. Photoluminescence is the mechanism by which the fluorescence is activated. In glowing diapers, we see the afterglow or phosphorescence. You can find out more about flourescence at the Thomas S. Warren Museum of Fluorescence. http://www.sterlinghill.org/warren/index.
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