Is lead glaze suitable for ceramic tableware?

For some unsafe ceramic tableware, the problem is mostly in the glaze. So what is glaze? What kind of glaze or craft is safe? The main component of the glaze is silicon dioxide, which covers the ceramic surface thinly, which is equivalent to a layer of glass. Glaze is like ceramic clothes. It plays a role in preventing pollution and easy cleaning. There is also a very important point: beautiful. Glaze is an important aesthetic factor of chinaware ceramic, especially porcelain glaze, which is varied and beautiful. Generally, it can be divided into green glaze, white glaze, black glaze, and color glaze. In the ceramic glaze, something called flux needs to be added to promote the complete melting of the glaze during the firing process, thereby forming a glass-like substance. There are many kinds of fluxing agents. There is a glaze that uses lead as the fluxing agent, which contains about 20% lead oxide. This glaze is soft and unstable. If it is used to hold food, it is easy to cause lead pollution. Lead glaze has a very low melting point and is used on low-temperature pottery. For example, Tang Sancai and Liuli are all lead glazes. Although the country prohibits the use of lead glaze for white porcelin dinnerware, there are still some small workshops that still produce lead glaze ware. If you encounter pottery of unknown origin, the glaze is bright, opaque, and the sound is low, it is best not to buy it for white porcelin dinnerware. As for the glaze of porcelain tableware, feldspar and lime are generally used as flux, and the coloring agent is copper and iron. It is safe and non-toxic and can be used with confidence.

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