A Jellyfish Painting Painted With Glow Paints Glow in the dark powders absorb light (Charge). When glow powder is placed in a dark area the powder discharges (Glows in the dark) To learn more about glow powders visit our website: http://www.glowpaint.com.au/glow-in-the-dark-pigment-powder Tip: Glow pigments need to be charged using a natural or artificial light source because these pigments absorb light energy. Once placed in a dark environment these glow pigments will discharge (glow). You can use a UV blacklight to charge these glow pigments. For the best glow effect use this product in an area that is in pitch black darkness.