Direct on frit. it is a stable quality porcelain enamel frit, one coat one fire, can be applied to enamel cookware / gas stove / bbq. acid resistance black frit. it is a high quality acid resistance black frit, one coat one fire, can be applied to enamel cookware / gas stove / bbq. Finnhomy hard porcelain enamel aluminum cookware set, ceramic cookware set, new technology double nonstick coating ptfe pfoa free kitchen pots and pan set, 14-piece, agave blue. 4.5 out of 5 stars 135. $95.99 $ 95. 99. get it as u2026 Ceramic enamel frits contain finely ground glass mixed with inorganic pigments to produce a desired color. the coated glass is then heated to about 1,150u00b0f, fusing the frit to the glass surface, which produces a ceramic coating almost as hard and tough as the glass itself. Oct 17, 2019u00a0u00b7 ceramic cookware is safe when used with high heat. when the pan is chipped, it is still safe to use. compared to teflon, cast iron or anodized aluminum, porcelain enamel cookware is a safe and durable nonstick option.