Home > Listing of Enamels > Lump/Frit/Square/20 MeshClick Image To View Larger 118 White (op) (Lump) 12 ounces are available $8.00 Quantity: - + Lump form enamel, Thompson Enamel for Copper, Silver, Gold, Iron and Steel. Should be fired at 1450 to 1550 degrees F. All Enamel is pre-1990, and lead bearing.