In one embodiment, the facecoat region is formed from {HEAD ~ a slurry composition} comprising an aluminum oxide, a green chromium oxide and {TAIL ~ a silicon dioxide} 
In one embodiment , the facecoat region is formed from { HEAD ~ a slurry composition } comprising an aluminum oxide , a green chromium oxide and { TAIL ~ a silicon dioxide }
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL