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Sep. 09, 1980 - Tattletale Glow; These sand size tags being examined by a technician at the General Electric Research and development center, Schenectady, NY contain special magnetic particles and phosphors that glow under ultraviolet (UV) light. Developed by GE under the sponsorship of the US Treasury Department's Bureau of Alcohol, tobacco, and firearms. the tags can be coded magnetically and blended into explosives during manufacture to identify the make r and the date and place of shipment information to help law enforcement officers track down illegal users. The magnetic particles and phosphors are held together by special glass of polymer binders to survive detonation of such high energy explosives as niroglycerine, TNT, and dynamite. Test quantities of the tiny tags are now being produced at GE's heavy military equipment department, Syracuse, NY. The phosphors, formulated by GE's Quartz and chemical products department, Cleveland, Ohio, withstand the high temperatures and pressures generated by explosions and aid in tag retrieval by glowing brightly when the debris is examined under UV light
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