Home > Listing of Enamels > Vintage EnamelClick Image To View Larger 318 Apple (op) *2 ozs. are available* $5.00 Weight 1 oz ($5.00) 3101:=:5 Quantity: - + Opaque, cataloged, Thompson Enamel for Copper, Silver, Gold, Iron and Steel. This enamel is "medium fusing" and should be fired at 1450 to 1550 degrees F. for approximately 2 to 4 minutes. All Enamel is pre-1990, 80 mesh and lead bearing.