This invention relates to {HEAD ~ the field} of optical taggants and more specifically, to materials and methods for tagging explosives and {TAIL ~ propellants} for forensic identification, quality control, and other purposes 
This invention relates to { HEAD ~ the field } of optical taggants and more specifically , to materials and methods for tagging explosives and { TAIL ~ propellants } for forensic identification , quality control , and other purposes
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