b) 0.25 to 15% by {HEAD ~ weight}, based on total solids in the composition, of {TAIL ~ a lead tellurium lithium oxide} wherein the lead tellurium lithium oxide comprises 0.1 to 5 wt % Li2O; and 
of
b ) 0.25 to 15 % by { HEAD ~ weight } , based on total solids in the composition , of { TAIL ~ a lead tellurium lithium oxide } wherein the lead tellurium lithium oxide comprises 0.1 to 5 wt % Li2O ; and
OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH