It is preferable that {HEAD ~ the colored wafer back surface protective film} has {TAIL ~ a laser} marking ability 
It is preferable that { HEAD ~ the colored wafer back surface protective film } has { TAIL ~ a laser } marking ability
OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH