Ceramic tableware that does not meet the standard will be harmful to health, one way to teach you to identify

Underglaze coloring is simply to paint first, then glaze-directly use paint on the raw embryo or baked blank to create, then apply a layer of glaze and kiln fire. The embryonic form can be traced back to the Song Dynasty, and is dominated by blue and white, red in glaze and colorful underglaze. In-glaze color A layer of glaze is applied to the green body, and then painted on the surface, and then a layer of glaze is applied after completion. This is a decorative technique developed in the 1970s, mainly painting and decals. On-glaze color Firstly, the porcelain is fired into white glazed ware, then painted directly on the glazed surface, and then fired in the kiln. The second firing temperature is lower than that of the first firing. The porcelain made by this method is more suitable for display, because the color can be very gorgeous, but sometimes it is not suitable for holding high-temperature food. This is the coloring method created on the basis of underglaze blue and white painting in the Ming Dynasty, mainly ancient color, pastel color, new color and enamel color. In most cases, paint materials are low-cost chemical materials, which are likely to contain heavy metal elements such as lead and cadmium. In the underglaze and in-glaze colors, a layer of glass (glaze) wraps the paint, which also wraps the heavy metal elements that may be contained. In this way, it is clear at a glance which kind of porcelain is dangerous: overglaze. Because its paint material will directly contact food, it is easy to release heavy metal elements at high temperature, causing harm to the human body. How to burn to insure? high temperature! To determine whether the ceramic white porcelin dinnerware is safe, in addition to whether the painting material is in direct contact with the food, but also the firing temperature. Because in the process of high-temperature calcination, harmful substances disappear after a chemical reaction. The glaze is a glass body formed by high temperature processing of the glaze, and heavy metal elements will hardly remain after such high temperature processing (about 1200 degrees Celsius). The baking temperature of the overglaze color is only about 800 degrees, which cannot meet the 'high temperature' conditions mentioned above. In this case, security depends on the quality of the paint. The better the quality, the lower the content of lead and cadmium. How to recognize overglaze colors at a glance At this point, everyone must be especially interested in knowing how to recognize overglaze, underglaze, and underglaze. The easy way is to touch it directly with your hands. In-glaze and under-glaze are covered with a layer of glass, so they feel smooth to the touch, while over-glaze is uneven. If it is indeed an overglazed white porcelin dinnerware, you can soak it in vinegar to see if there is visible fading or even the paint peeling off after a few hours. If so, it is recommended to use less. In general, high-temperature porcelain is better. If there is paint decoration, then underglaze color is safe. Overglaze porcelain white porcelin dinnerware is more suitable for display, or for cold food. Good-quality porcelain tableware generally leaves the ornamentation outside the appliance, while the inner wall is left blank or decorated with high-temperature underglaze colors. This will not only better reflect the nature of the food, but also healthier.
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