Home > Listing of Enamels > Vintage EnamelClick Image To View Larger124 Black Medium Fusing (op) Opaque, cataloged, Thompson Enamel for Copper, Silver, Gold, Iron and Steel. This enamel is "medium fusing" and should be fired at 1400 to 1500 degrees F. for approximately 2 to 4 minutes. All Enamel is pre-1990, 80 mesh and lead bearing. $4.00 Weight 1 oz ($4.00) 8 ozs ($32.00) 16 ozs ($64.00) 1747:=:4,1749:=:32,2424:=:64 - +