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 Sculpey. Conforms to ASTM D 4236. Made in USA.