Acid resistant cast-iron white cover coat: 310.2: 820-850: more: note: enameling on surface of cast iron, as called wet-way coating enamel first, cleaning the surface of earthen bowl after anneal . 1 milling additon ratio for cast-iron black enamel: frit: 100: clay : 5-7: quartz powder: 0-5: borax : 0.5-0.8: sodium nitrite: 0.2 Cast-iron enamel bbq glossy black enamel frit for egc-635by nolifriton fri 13 dec, 2019 1:10 am: enamel surface in just one time coating and firing 3 smooth enamel surface and high glossiness for glossy frit good acid resistance cast iron e.... Cobalt-nickel ground coat frit is most widely applied. antimony- molybdenum ground coat is in white color, other name white ground coat. its cost is lowest. usually be used for daily enamel cookware. compound ground coat frit is mixed by many kinds of ground coat frit u2026 This is better for the full oxidation of stainless steel substrate, also good to let enamel layer permeate into stainless steel, to form strong adherence. as there u2019 re cobalt oxide and nickel oxide in ground coat, so the color of single ground coat is blue or black. if you want to get other colors, cover coat will be needed for second coating.