There are a few glow in the dark clays on the market.
It glows after you bake it! Create something, bake it, then expose it to the light and it glows.

Or, how about making your own?  Mix our powders with translucent polymer clay for a great effect.  Take a look at the article and instructions offered by Ginger at The Blue Bottle Tree.

 

Glow in the Dark

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