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