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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  • Sculpey Glow in the Dark Kit

    Sculpey®

    Sculpey Glow in the Dark Kit

    POLYFORM-Sculpey Kit: Glow In The Dark. This clay really glows! Simply shape and bake the clay, expose it to light and watch it glow! This package contains four 1 oz glow-in-the-dark Sculpey, one 1 oz bar of black Sculpey, and one 1 oz bar of white...

    $8.00
    $9.19
    Add to Cart The item has been added
  • Sculpey Glow in the Dark Kit

    Sculpey®

    Sculpey Glow in the Dark Kit

    POLYFORM-Sculpey Kit: Glow In The Dark. This clay really glows! Simply shape and bake the clay, expose it to light and watch it glow! This package contains four 1 oz glow-in-the-dark Sculpey, one 1 oz bar of black Sculpey, and one 1 oz bar of white...

    $8.00
    $9.19
    Add to Cart