Home > Listing of Enamels > Vintage EnamelClick Image To View Larger 857 Ultramarine (opal) (TE) $0.00 Weight 1 oz (+$5.00) 8 oz (+$40.00) 16 oz (+$80.00) 1985:+:5,1987:+:40,2623:+:80 Quantity: - + Opalscent, 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.