Ceramic dinnerware: colorful glaze

July 06, 2022

Ceramic dinnerware has a variety of shapes, delicate and smooth, bright colors and easy to clean. It is the first choice for most families to buy dinnerware. However, the glaze on the ceramic surface has the potential to be a health killer.



Ceramic dinnerware is a kind of dinnerware that is frequently used in people's homes. We are concerned about how to ensure health in diet every day, but few people pay attention to dinnerware. Ceramic dinnerware has a variety of shapes, delicate and smooth, bright colors and easy to clean. It is the first choice for most families to buy dinnerware. However, the glaze on the ceramic surface has the potential to be a health killer.


Lead, mercury, radium, cadmium, etc. in colored glaze are all elements that are harmful to the body. The radioactive element radium kills white blood cells. Cadmium, lead and mercury are all heavy metals. Cadmium and lead can cause liver or other internal organs poisoning, and mercury can cause liver and kidney cirrhosis. When using unqualified ceramic products, these harmful substances will dissolve, and as food enters the human body, it will cause chronic poisoning for a long time. At the same time, attention should also be paid to the clay used for making ceramics. Poor quality clay contains a lot of microorganisms and harmful substances. Even if it is not painted with color glaze, it will damage human health. Therefore, the specifications and quality of the products are particularly important. The color-glazed ceramics that meet the standards are basically harmless to the human body, while the colorless ceramic dinnerware that looks clean may bury hidden dangers for health.


dinnerware is an indispensable tool for eating, and it is closely related to our health. How to choose healthy, beautiful and practical ceramic dinnerware?



First, choose by looking at the porcelain.


When purchasing ceramic dinnerware, it is better to use bone china and reinforced porcelain, both of which are the materials of high-quality dinnerware. Bone china is recognized as a high-grade porcelain in the world. It is natural milky white, with high transparency and light and delicate texture. The molding and color formation of bone china itself mainly depend on silica, alumina and calcium oxide. The higher the content of calcium oxide, the better the color. In nature, there are not many sources of calcium oxide, and animal bone meal is often chosen as the source of calcium oxide. In recent years, new bone china, which selects mineral synthetic bone powder as the source of calcium oxide, has emerged and become a new force in the high-end bone china market. When the content of bone powder reaches a certain proportion, the quality of porcelain will be greatly improved, which is mainly reflected in the gloss and moisturization of the utensils. It is as white as jade, crystal clear and moist. It is an ideal product for various households, and its price is inferior to that of bone china.



Let's look at the way of flower decoration. According to the characteristics of the flower surface, it can be divided into on-glaze color, in-glaze color, under-glaze color and color-glazed porcelain and some uncolored white porcelain. Underglaze colors are mostly traditional blue and white and exquisite blue and white colors, with relatively monotonous colors and moderate prices; underglaze colors are richer than underglaze colors, and the product grades are higher, but the process requirements are strict, the cost is high, and the price is also high; On-glaze ceramics are rich in color, strong in three-dimensionality but low in surface smoothness, easy to process, and therefore relatively low in cost. The above different decoration methods, in addition to their different artistic effects, are mainly different in the content of heavy metal elements such as lead and cadmium. Among them, the content of lead and cadmium in underglaze color, underglaze color and most of the color glaze porcelain and white porcelain is very low, and if the on-glaze color uses inferior pigments in the processing of ceramic flower paper, or in the design of flower surface If the amount of pigments containing high lead and cadmium is too large, or the temperature and ventilation conditions are not enough during roasting, it is easy to cause excessive lead and cadmium dissolution.



Second, choose through "listen", "comparison", and "try".


Listen: It is to listen to the sound made when the porcelain is tapped lightly. If the sound is crisp and pleasant to the ear, it means that the porcelain body is fine and dense, and there is no cracking.


Compare: compare. For matching porcelain, it is necessary to compare the accessories to see if the shape and picture decoration are consistent. Especially the complete set of blue and white or blue and white exquisite porcelain, because the color of blue and white varies with the firing temperature, so it is the same blue and white porcelain, the color is dark or light, a set of several or even dozens of cold porcelain, such as each piece. There are obvious differences in the color of blue and white, and this set of porcelain is greatly inferior.


Test: It is to test the cover, test the installation, and test. Some porcelain has a lid, and some porcelain is composed of several components. When choosing porcelain, don't forget to try the lid and try to assemble the components to see if they are suitable.


Third, choose from the shape.


It depends on whether the shape is normal, whether there are damage, spots, bubbles, and smoothness. Prickly, spotty, or even cracked ceramics on the surface, the lead contained in the glaze is easy to overflow, and it is not suitable for dinnerware. Porcelain surface glazes are all fired at temperatures above 800°C, but less than 800°C, low-temperature glazes will have harmful substances to the human body. Porcelain is best when it reaches 1350°C.


In addition, the purchased ceramic dinnerware should be soaked and boiled in vinegar water first, which can remove most of the toxic substances and greatly reduce the potential harm of ceramic dinnerware to the human body. Do not use ceramic dinnerware to store acidic food and beverages such as fruit juice, wine, and coffee for a long time. Because the longer the ceramic dinnerware holds acidic food or beverages and the higher the temperature, the easier it is to dissolve lead, which is equal to aggravating the toxic and side effects of lead dissolution.

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