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