Is ceramic glaze toxic?
Do you often hear that it is toxic to ceramic tableware with color or patterns, don’t use it. Because they release toxic substances during the heating process, for example, the pigments used to draw ceramic patterns contain heavy metals such as lead and cadmium.
For more details on the printed design ceramic dinnerware set, please refer to the previous article: How to distinguish between hand-painted ceramics and decal
Note:
Lead is a poison that affects all systems and organs of the body, and its toxicity lasts a lifetime, not to mention children. Severe cases can lead to lifelong disability.
Cadmium accumulates in the kidneys after entering the human body, eventually causing uremia. It ranks 7th among the 275 most toxic environmental toxins in the United States by the Centers for Disease Control and Prevention.
This statement is very one-sided and inaccurate.
At the dinner table, safety is more important than beautiful tableware. But not all the nice dinnerware sets are used. If we have more knowledge about ceramics, and learn how to choose the regular porcelain manufacturers (@YDYporcelain1999). we still can purchase and use them. because their qualified products are produced by national standards theirs qualified products produced in accordance with national standards.
For details, please refer to the previous article: Tableware | Overglaze colors look nice, but underglaze colors are easier to use
What is overglaze?
Overglaze painting uses various colored materials to paint on the glaze surface of fired porcelain, which then needs to be put into the kiln for the second time to solidify the pigment at low temperature. Therefore, many materials can withstand the temperature, so porcelain often has more diverse color expressions and patterns. However, due to the lack of protection of the transparent glaze layer, overglaze tableware is more prone to fading and falling off. Its durability and difficulty in cleaning will be significantly higher, so the dishwasher’s labor-saving cleaning method is unsuitable for overglaze tableware.
Therefore, if organic food is placed on an overglazed dinner set, lead and cadmium will easily dissolve and be brought into the body, causing chronic poisoning that is difficult to detect; and if low-quality overglaze-painted porcelain with a variety of patterns is used to make tableware, it is very likely to cause acute heavy metal poisoning.
How to guide whether it is overglaze color?
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Use the feel to see the craftsmanship
The overglaze color has paint on the glaze, the surface is rough and lacks luster. The pattern has a distinct concave and convex feel when touched.
The in-glaze painting is relatively smooth and has no obvious bumps and depressions.
Underglaze color not only has a smooth surface but also has a reflective effect on the color surface.
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Price
Don’t buy low-priced ceramic dinner set. Be sure to purchase products from regular brands.
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Use tools to judge
People who professionally purchase ceramic tableware usually use a knife to scrape the patterned area. If it can be scraped off, it is generally an overglaze color product. Or soak it in vinegar for a few hours. If the color changes significantly, it means that it is low-quality tableware and it is recommended not to use it.
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Choose white or light-colored tableware
When purchasing tableware, we can also choose white or light-colored tableware. If you like tableware with patterns, it is recommended to choose tableware that does not have patterns on the surface in contact with the actual object.
Finally, not all overglaze colors are toxic. With the improvement of modern technology, the lead and cadmium in colored and beautiful patterns are very small, which is not enough to affect human health. As long as we choose the regular manufacturer correctly.
FAQ
A: Is ceramic glaze toxic and harmful to the human body?
Q: Ceramic glaze is non-toxic and is a production process.
Glaze is a thin layer of colorless or colored glass covering the surface of ceramic products. For details, please refer to this article Why do ceramics need to be glazed?
A: Is the glaze on tableware harmful to the human body?
Q: Overglaze colors look nice, but underglaze colors are easier to use
In order to prevent the harm of glaze, it is best to buy tableware with “underglaze colors” or tableware with white inner wall. If you buy “overglaze colors” tableware, put it in water first, or add a little vinegar, soak it first, and then boil it, so that the heavy metals can be dissolved. In daily life, do not use this kind of tableware to hold acidic drinks and food to avoid poisoning.
A: Is the glaze on porcelain tableware toxic?
Q: Ceramic tableware is considered to be non-toxic tableware, but in recent years we often see some articles related to poisoning from the use of ceramic tableware. This is because some informal manufacturers do not have a high firing temperature or the glaze ingredients do not meet the standards during the production process, resulting in excessive lead in the tableware. People buy inferior tableware without knowing it, and when the tableware is heated, excessive lead may overflow from the glaze surface and mix into the food.
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