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