The indicia are made of {TAIL ~ a material} responsive to {HEAD ~ UV emissions} to render the indicia visible 
The indicia are made of { TAIL ~ a material } responsive to { HEAD ~ UV emissions } to render the indicia visible
OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH