Phosphorescent Green is a Heavy Body paint that can be applied to various surfaces. The unique pigment used has the ability to absorb and store natural and artificial light. Once the light source is removed (i.e. when the lights are turned off or the painted object is taken into a dark area), a bright, greenish glow is emitted for up to 15 minutes. The glow steadily diminishes as the stored light energy is released. In order to maximize the effect, apply several layers. To hide the Phosphorescent Green during normal viewing, apply the medium over a base color that is similar in hue and value. This will allow even heavy coatings to be undetectable during normal lighting. Using this technique will allow for "hidden" messages or graphics to be put into an artwork!Details:Phosphorescent GreenAvailable in assorted sizesAbsorbs natural and artificial lightGlows for up to 15 minutesWater-based