Ultra Violet Light Sensitive Phosphorus Powder or UV Phosphorus Powder is a product that glows only when exposed to UV light (black light). With a body color of white or light-green, these powders can glow in colors like green, blue, yellow, purple, red and violet. These powders only glow when exposed to UV light. Remove the UV light source and they stop glowing. Glow effects are visible in both bright and dark environments. Similar to Glow Powder, this product must be mixed with clear ink in order to produce UV Phosphorus Paint.