The Sirchie UV203 is a Pale Yellow/Brilliant Yellow Invisible Detection Powder. Powders are compounded in various natural colors to blend with diverse object backgrounds to reduce visual detection. Good adhesion properties aid in target-to-hand, body or clothing contact. Apply a light dusting to the target object with a soft bristle brush. Highly fluorescent when exposed to longwave ultraviolet radiation using any Sirchie longwave (UV) light source.