At night, Night Glo Phosphorescent colors glow in the dark. Speedball Fabric Screen Printing are for use on cotton, polyester, blends, linen, rayon and other synthetic fibers (NOT for use on nylon). Also works great on paper and cardboard. Wash fast when properly heat-set. Non-flammable, contains no solvents and no offensive smell. AP Non-Toxic, conforms to ASTM D-4236. Can be screen printed or painted on with a brush. Archival qualities.