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