The beads may be added to substances such as explosives in order to create a distinctive optical signature that identifies a manufacturer, lot number, etc. in {HEAD ~ the event} of {TAIL ~ the need} for forensic analysis 
of
The beads may be added to substances such as explosives in order to create a distinctive optical signature that identifies a manufacturer , lot number , etc . in { HEAD ~ the event } of { TAIL ~ the need } for forensic analysis
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH