Home > Listing of Enamels > Vintage EnamelClick Image To View Larger 866 Cerulean (op) $0.00 Weight 1 oz (+$6.00) 2560:+:6 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.