Although both pigmentary and {HEAD ~ nano ZnO} show {TAIL ~ improvements} in tint strength ; the nano ZnO particle effect is more efficient 
show
Although both pigmentary and { HEAD ~ nano ZnO } show { TAIL ~ improvements } in tint strength ; the nano ZnO particle effect is more efficient
OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH