Dear Margaret, Don't ask me why I know this, but there is actually a company that sell such a product, in a kit form. It's called Glo Germ, and is used to demonstrate the importance of handwashing, etc. It is essentiall a liquid product, oil based I think, that contains little UV beads which illuminate with weak UV excitation. They have a pretty good web site at www.glogerm.com if you want more info. Hope this helps! Viki Mosiman
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