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