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