CSI workers routinely dust for fingerprints to shown hidden traces. Now an aerosol spray could let them do something similar for common explosives too. Spraying an object with the aerosol and illuminating it with an ultraviolet torch makes the object glow blue. But any colorless patches betray traces of explosive as faint as a trillionth of a gram per square centimeter. Some explosives can already be tested for using portable devices that detect vapors released in even trace amounts. (source: technology.newscientist.com)
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