Home > Listing of Enamels > Vintage EnamelClick Image To View Larger 463 Charcoal (op) $7.00 Weight 1 oz ($7.00) 8 oz ($56.00) 16 oz ($112.00) 1887:=:7,1889:=:56,1890:=:112 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.