Home > Listing of Enamels > Opalescent EnamelClick Image To View Larger 2001 Opal Jewel Effect (A) (Lump Only) (opal) (TE) $0.00 Weight 1 oz (+$5.00) 8 oz (+$32.00) 16 oz (+$64.00) 9391:+:5,9392:+:32,9390:+:64 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.