When exposed to a long wave UV lamp (black light), these detection powders have a powerfully brilliant fluorescent quality impervious to washing. Supplied in a variety of natural colors to blend with nearly any background to eliminate visual detection by the perpetrator. These fluorescent detection powders are manufactured in our laboratories solely for the purpose of criminal detection. Our powders also provide excellent adhesive properties which assures transfer from the treated article to the suspect's hands or clothing. These invisible detection powders are recommended for indoor application. Supplied in two ounce volume jars.