Our Invisible Thief Detection Pastes are manufactured in a formulation which fluoresces brilliantly when exposed to a longwave UV lamp and are specially compounded for outdoor applications. They will not harden or dissolve when exposed to the elements and are unaffected by wind, rain, heat, or cold weather. When applied in a thin film, the material remains invisible to the naked eye and transfers easily to the suspect's hands or clothing. Excellent for use on telephones, door knobs, automobiles, window sills, etc. Available in two ounce volume jars.