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How to distinguish whether ceramic tableware is safe

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glaze is the glaze formed after high temperature. It is basically at a high temperature of more than 700 and will not be toxic. However, the painting materials are basically low-cost chemical materials, which will contain some heavy metals. You can touch the place of the pattern with your hand. If the hand feeling is obvious, it is the glaze. The hand feeling of the underglaze color is smooth, and the patterns are under the glass

ceramic tableware is not always safe. Ceramic tableware is not always safe. Long term use of some tableware will cause chronic poisoning of heavy metals and damage the skin, teeth, eyes, brain, bones and fertility. These harmful substances are mainly heavy metals such as lead and cadmium contained in ceramic tableware. The degree of damage mainly depends on the amount of these heavy metals dissolved in use and absorbed by the human body

extended data:

precautions:

1. Try not to use ceramic tableware with large area patterns inside

2. Never use ceramic tableware with flowers inside and eat foods that are too sour and salty

3. Ceramic tableware placed for too long shall be cleaned and wiped with hot water before use

4. After cleaning, the ceramic tableware shall be dried or dried as much as possible for storage

5. Never use ceramic tableware with flowers inside to store food for a long time

6. Do not use ceramic tableware with flowers inside to cook food at high temperature

reference source: Baidu Encyclopedia – ceramic tableware

judge whether the porcelain tableware contains lead or is toxic:
1. At present, the ceramic utensils in circulation in the market can be divided into overglaze color, underglaze color, colored glazed porcelain and some uncolored white porcelain. Due to the different decoration methods of ceramic tableware, the possible impact on health is also different. Among them, the content of lead and cadmium in in glaze color, underglaze color and most colored glaze porcelain and white porcelain is very low. 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 bone ash porcelain is white, with transparent porcelain and smooth glaze, which is deeply loved by consumers. However, the production of this kind of porcelain is difficult, and most of them adopt high-temperature plain firing and low-temperature glaze firing technology. Its glaze adopts low-temperature lead containing glaze. If the production process is not properly controlled, the lead dissolution is also likely to exceed the standard
2. 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 and bright patterns on the inner wall of glazed and underglazed ceramic utensils and tableware
3. Never buy Tableware with patterns that can be wiped off by hand
4. For products that are not at ease, soak them in vinegar for several hours. If there is a significant change in color, they should be discarded
identify the quality of ceramic tableware as follows:
1. Hold the ceramic in your hand and observe it. The color of good ceramics is the unique natural milky white of natural bone powder. Observe the permeability of Ceramics against the bright light to see whether the composition of the cup is meticulous or not. Good ceramics should have good light transmission and uniform without impurities
2. Feel the delicacy and hardness of porcelain by hand. The addition of bovine bone powder makes the weight of ceramics lighter than other kinds of porcelain. It can be thinner than ordinary porcelain. The finished product is light, dense and hard (twice that of daily porcelain) and is not easy to crack
3. With a flick of your index finger and thumb, you can hear the “Ding” of ceramics. If you rub your hand with water at the mouth of the bowl, it will make a sound similar to that of an airplane flying by. Of course, the sound is relatively small, so you should listen carefully.

with the popularity of Korean dramas in recent years, Korean exquisite ceramic tableware has become a new trend of tableware. Many small home stores in Zhongshan sell ceramic tableware. Ceramic tableware is not easy to rust, corrode and absorb water. The surface is hard and smooth and easy to wash. Now the ceramic tableware has added color, the pattern is more fashionable, and the style is ever-changing, which is deeply loved by consumers. The whole set has also become a major scenic spot on the dining table
there is a secret to distinguish glaze color
the beautiful patterns of ceramic tableware are glaze color, and the method of glazing color determines the safety of ceramic tableware. Glaze is divided into overglaze color, underglaze color and underglaze color. Only overglaze color is unsafe
the resolution method is very simple. The surface is smooth, such as the in glaze and under glaze color of glass. The dissolution of lead and cadmium in ceramics is very little or almost no, so you can buy it safely; For the overglaze color products with concave convex surface, the products with less surface decorative patterns should be selected as far as possible. Secondly, if the overglaze color ceramics are touched by hand, there is a concave convex feeling on the surface of the products, which is uneven with the naked eye; If you touch the surface of the products with your hands, it will be as smooth as glass without feeling uneven. Among them, the vast majority of in glaze and under glaze colored porcelain can be purchased at ease; If inferior pigments are used in the processing of overglaze colored porcelain, it is easy to cause the dissolution of lead and cadmium to exceed the standard. If you buy a product you don’t trust, you can soak it in vinegar for a few hours. If you find a significant change in color, you should discard it. In addition, the raw soil for ceramic firing contains different minerals due to different producing areas, and the soil with high silicon mercury content is not suitable for firing tableware
when choosing overglaze products, consumers should pay attention to whether the pattern color is bright. If it is not bright, the dissolution of lead and cadmium is often high. Do not be greedy for small and cheap to buy three no ceramics on the street. It is difficult to ensure the safety of street ceramic tableware, because it has no brand and production standard at all. If economic conditions permit, we should also choose the “green” tableware with lead-free glaze, which is more expensive than ordinary ceramic tableware. It is generally available in supermarkets. For example, Bone China is recognized as a high-grade porcelain in the world, and its calcium oxide content is very high because animal bone powder is selected as one of the raw materials. White porcelain bone porcelain does not contain lead and cadmium, and the picture is not easy to wear. It is also suitable for microwave oven. It is a well deserved “green” ceramic
■ tips if you buy uncertain ceramic tableware, you can use some small methods to test it
ceramic tableware is afraid of acid. Before using the newly purchased ceramic tableware, soak it in vinegar to dissolve most of the lead; When using, do not use colored ceramic tableware to contain acidic food
in addition, when using, pay attention to the maintenance of ceramic tableware. Do not scrub ceramic tableware with metal wire, because it is easy to cause glaze scratch, and the scratch is easy to absorb dirt and cause the dissolution of lead and cadmium in the pattern, which is harmful to human health.

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