Home > Listing of Enamels > Vintage EnamelClick Image To View Larger 457 Green (op) $3.00 Weight 1 oz ($3.00) 8 oz ($24.00) 16 oz ($48.00) 3908:=:3,3907:=:24,3909:=:48 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.