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