{HEAD ~ the binder} including a Lead Borosilicate glass composed of Lead Oxide, Lead Silicate, Boric Oxide and Aluminum Oxide, or {TAIL ~ a Lead Boroaluminosilicate glass} composed of Silica, Aluminum Oxide, Boron Oxide, and Lead Oxide, 
{ HEAD ~ the binder } including a Lead Borosilicate glass composed of Lead Oxide , Lead Silicate , Boric Oxide and Aluminum Oxide , or { TAIL ~ a Lead Boroaluminosilicate glass } composed of Silica , Aluminum Oxide , Boron Oxide , and Lead Oxide ,
HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH