Glow Stone

Glowstone is a synthetic aggregate, based on Photoluminescent pigment and synthetic resin. When exposed to light sources, the photoluminescent pigment within Glowstone becomes chemically excited and will afterglow (i.e. glow in the dark), initially very strongly, then reducing slowly overnight. The glow is best seen in a dark area, where ambient light sources such as streetlights and moonlight are absent.