37B.Ferro Frit 3498 Raw Weight: 341.81 Analysis & Unity Formula: PbO 1.00 Al2O3 0.08 SiO2 1.83 PbO 65.30 % Al2O3 2.50 % SiO2 32.20 % Comments: Contains lead; Hammond B300 is similar (from Tony Hansen, Clayart archives 11 Mar 98)