glow in the dark sand | uv black light reactive | longest brightest glow (green, 2 ounces (60g)) techno glow inc <b>green glow in the dark powder</b> <br> <br> ★ luminosity: green <br> ★ daytime color: light green (opaque) <br> ★ uv color: green <br> ★ particle size: 100-150 microns (comparable to table salt) <br> <br> when fully charged this powder will glow at 5921 mcd/m2 after 1 minute, level off to 139 mcd/m2 after 1 hour and will continue to glow for up to 30-40 hours. the length of time a glow powder is said to "glow" is defined as the time it takes for the afterglow brightness to diminish to 0.32 millicandela (100x the human visible perception limit). <p></p> <b>compatible mediums:</b> <p>glow powder can be mixed with clear mediums e.g. resin, epoxy, paint, glass, nail polish, clay, rubber, cement, ceramic, silicone, glaze, glue etc. it is not soluble, heavier then water & odorless. it needs a medium firm enough to hold the pigment in place. do not use not-encapsulated with water paint. glow powder is the basic ingredient for most glow in the dark products used by consumers, businesses, education and government agencies, artists, scientists etc.</p> <b>glow information:</b> <p>glow in the dark powder can be charged, and discharged indefinitely, making them very economical to use. it will charge by any uv light from the higher spectrum such as sunlight or a white light bulb and also glows under a black light. made from strontium aluminate doped with rare earth elements dysprosium and europium. europium is the most reactive earth element ever discovered. it can give an astonishing glow time for as long as up to 40 hours, which puts it at the cutting edge of technology.</p> <b>safety information:</b> <p>environment friendly, not toxic, hazardous, flammable or radioactive. contains no soluble heavy metals. not food safe.</p> <b>scroll up and grab some glow in the dark powder today!</b>