Home > Listing of Enamels > Vintage EnamelClick Image To View Larger 426 Flux (soft flux) (tr) $8.00 Weight 1 oz ($8.00) 8 oz ($64.00) 16 oz ($128.00) 1882:=:8,1884:=:64,1885:=:128 Quantity: - + Transparent, 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.