Home > Listing of Enamels > Vintage EnamelClick Image To View Larger 124-A Black *Hard-Fusing* (op) $6.00 Weight 1 oz ($6.00) 8 ozs ($48.00) 16 ozs ($96.00) 9204:=:6,9205:=:48,9203:=:96 Quantity: - + Opaque, cataloged, Thompson Enamel for Copper, Silver, Gold, Iron and Steel. This enamel is "hard-fusing" and should be fired at 1425 to 1550 degrees F. for approximately 2 to 4 minutes. All Enamel is pre-1990, 80 mesh and lead bearing.