Green Super Phosphorescent Glow in the Dark Powder Pigment 1/2 oz - No UV Light Needed! No UV or Blacklight Needed, Charges with the sun or indoor lighting Glows Green in the dark - Neutral off white day color Long Afterglow 12+ hrs, Glo Effex powders are doped with the rare earth mineral Europium for the ultimate glow Works in Water or Solvent Based Mediums Non-Toxic and Odorless - Great for paint, epoxy, resin, slime, etc.