Bright Green Glow-in-the-Dark Powder 75 gram ~ Pigment 75 Grams (2.65oz) Ultra Bright Green Glow in the Dark Powder Particle size of 30-45 Microns (um) Made from rare Alkaline Earth Aluminates Glow can last for 8 hours or more when fully charged The chemical compound is non-toxic and non-radioactive.