Some ordinary ceramic tableware that looks beautiful may still have toxic substances on the surface due to improper processing. When choosing ceramic bowls, people may pay more attention to the surface defects such as appearance, color, cracks and spots, and sometimes ignore the quality of ceramic bowls. However, ceramic bowls are containers for holding food after all, so if we buy substandard toxic bowls, it will directly endanger our health. Let's take a look at how to buy ceramic bowls with Xiaobian!

1. Is the ceramic bowl poisonous?

In some ceramic tableware shops, it was found that some cheap ceramic tableware did not have the factory name printed on the bottom. The name of the factory is not printed because the raw materials and manufacturing technology used are not very good, and there will be chemical residues. If it is tested by relevant departments, it will definitely fail, so the manufacturer simply does not print the name and brand.

as for the manufacturing process of ceramic tableware, the commonly used ceramic tableware is made by firing clay and adding a layer of glaze water.

Before firing, glaze water usually contains red lead, which is commonly known as "arsenic". After proper firing, the red lead will be converted into harmless lead chemicals, so qualified ceramic tableware is harmless to human body. However, some unqualified ceramic tableware in the market is caused by insufficient baking temperature or improper processing by workers, resulting in excessive lead dissolution from ceramic products. When eating in such a bowl, lead may be leached out by organic acids in food.

Ceramic tableware for daily use is generally painted with color patterns. If inferior pigments or pigments with high lead and cadmium content are used in processing, and the baking process is not good, the lead and cadmium dissolution will easily exceed the standard. Long-term use of such tableware will lead and cadmium into the body with food. Lead can exist in the blood for a long time, causing vascular smooth muscle spasm, ischemia of important organs such as liver, kidney and brain, cell damage, affecting the normal metabolism of nerve cells, and also having adverse effects on the intellectual development of children. Kidney is the main target organ of cadmium damage, and it accumulates in bones, which can lead to decreased immunity, joint deformation and pain, commonly known as "painful disease".

experts suggest that you should go to big shopping malls and supermarkets with guaranteed purchase channels to choose ceramic tableware. At the same time, when purchasing ceramic tableware, you should pay attention to whether the appearance is straight, whether there are any damage, spots, bubbles and smoothness.

At the same time, you can tap lightly with your fingers, and the sound is crisp, indicating good quality; If the voice is dull or hoarse, it is inferior. Generally, thin-walled ceramic products should be looked after under sunlight or light, and they should be transparent, thin and light, and even in thickness. However, glazed colored ceramics are unqualified products where the picture is not as bright as the glazed surface, the feel is not smooth, and the edge of the picture has a convex feeling.

second, what kind of ceramic tableware may cause harm to lead and cadmium?

what kind of ceramic tableware may cause lead and cadmium hazards? According to experts, the ceramic tableware currently in circulation in the market can be divided into over-glazed, over-glazed, under-glazed, glazed and some unpainted white porcelain. Because ceramic tableware is decorated in different ways, it may have different effects on health. Among them, the contents of lead and cadmium in glaze, underglaze and most glazed and white porcelain are very low. However, if the amount of pigment containing high lead and cadmium is too large during processing or the temperature and ventilation conditions are not enough during baking, it is easy to cause the dissolution of lead and cadmium to exceed the standard. Another kind of ashes porcelain is white, its porcelain is transparent, its glaze is flat and smooth, and it is deeply loved by consumers. However, this kind of porcelain is difficult to produce, and most of them use high-temperature plain firing and low-temperature glaze firing technology. Its glaze adopts low-temperature lead-containing glaze, and if the production process is not properly controlled, the possibility of lead dissolution exceeding the standard is also great.

In order to avoid the possible adverse effects of tableware on health, experts warned that people should try to choose products with less decorative patterns on the inner wall of glazed and underglaze ceramic tableware and bright patterns. Never buy tableware whose patterns can be erased by hand; For products that are not at ease, they can be soaked in vinegar for several hours. If obvious color changes are found, they should be discarded.

When choosing children's tableware, you must choose some branded products. Don't be greedy for cheap products. At present, children's antibacterial tableware has been developed in China. Its bright colors are made of organic pigments, and it does not contain eight harmful heavy metals such as lead and chromium. The nano-silver material is added inside, which has the function of automatic sterilization and antibacterial, and has a good effect on children's resistance to germs.

Third, how to choose ceramic bowls

Steps/methods

1. When choosing ceramic tableware, don't choose glazed decoration, especially the inner wall of ceramic tableware. You can choose underglaze color or underglaze color decoration. For example, blue and white is a kind of ceramics that people like to decorate with underglaze color.

2, buy back the ceramic tableware, first soak it in 4 vinegar water and boil it, which can remove most of the toxic substances and greatly reduce the potential harm of ceramic tableware to human body.

3. Don't store acidic foods and drinks such as fruit juice, wine and coffee with ceramic tableware for a long time. Because the longer the ceramic tableware holds acidic food or drink and the higher the temperature, the easier it is to dissolve lead, which is equivalent to aggravating the toxic and side effects of lead dissolution.

4. whether the appearance is straight, whether there are any damage, spots and bubbles, and whether it is smooth. Ceramic products with prickly, mottled and even cracked surfaces are easy to overflow with lead in their glazes, so they are not suitable for tableware.

5. When choosing porcelain decorated with gold and silver, rub it with your hands, and it is the top grade if it does not fade.

6, a few taps, the sound is crisp and good quality, dull or hoarse voice is inferior.

7. Most porcelain adhesives contain high lead, so it is not suitable for tableware after porcelain repair.

8. The surface glaze of porcelain is made by firing at a temperature above 811 degrees. If it does not reach 811 degrees, low-temperature glaze will be harmful to human body. Porcelain reaching 1,351 degrees is the best.

9. When purchasing complete sets of ceramic products, we should see whether the glaze color, picture, luster and style of each piece are consistent, symmetrical and harmonious.

11. Thin-walled ceramic products should have a sense of transparency, be thin and light, and have a uniform thickness when they are looked after under sunlight or light.

Choosing ceramic bowls requires skill. Some ceramic utensils are harmful to human health, because they are decorated with overglaze colors. The glaze color contains some harmful metals such as lead, which will affect the functions of human hematopoiesis, nerves, kidneys, blood vessels and other organs. When the human body ingests a certain amount of lead, there will be symptoms such as vomiting, nausea and abdominal pain. Therefore, once neglected, the daily necessities necessary for this meal will be like a trace of poison? Like medicine, it gradually affects health. Therefore, we must not be greedy and cheap, but go to the mall to buy ceramic bowls with quality assurance.

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