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