Fake teapots generally refer to chemically dyed teapots. Using fake purple sand products can not only play a role in health care, but also endanger the health of users. Chemical raw materials are dissolved in tea, which makes people susceptible to hyperthyroidism, epilepsy and other diseases. According to CCTV reports, the reporter randomly bought 15 pieces of teapot and teacup in the market and sent them to the testing center of Shanghai Institute of Materials for testing. The test results show that 13 sample has abnormal heavy metal dissolution. Among them, the dissolution amount of manganese ion in black pot reached 2.62mg/L, and that of barium ion in blue pot reached 6.39 mg/L. Ma Chong, director of the Department of Chemistry of the Testing Center of Shanghai Institute of Materials, said that heavy metals have a high melting point and are difficult to volatilize during the calcination of purple sand pottery, and will eventually remain in the fired tea set, which may lead to different degrees of dissolution when used. Experts believe that long-term intake of metal ions such as barium, manganese, cobalt and chromium will endanger human health. Identification and selection of extended information teapot: at first glance, the real teapot is fresh and round in texture, with sub-light visual effect, and there are many evenly distributed small particles similar to metallic luster. Some handmade pots have radial lines from the center to the periphery, which belongs to the processing technology. Two touches: the real teapot feels delicate but not slippery, and the fake teapot feels rough or slippery; For example, ordinary clay feels rough, and porcelain feels slippery at first. If you press the friction slightly hard, it will feel rough. This is due to the different manifestations of molecular structure. Three turns: Turn the lid to make the lid of the real teapot turn flexibly and smoothly, and make a slight "silk" or "rustling" sound, while the fake teapot made of clay makes a dull "crackling" sound. Listen 4: Knock on the pot with the lid. Although some people disapprove, it is very effective. The knocking sound of a real teapot is crisp and pleasant, and the sound is short, and the sound stops immediately after knocking; The fake teapot with ordinary clay has a dull, rich and short knocking sound; The sound of porcelain knocking is clearer than purple sand, a bit like the sound of metal impact, which is difficult for ordinary people to distinguish. But there is a very obvious difference. The wavelength of sound waves in porcelain is obvious. After the tapping, the sound still lasts for several milliseconds, and the real purple sand stops immediately. Five Certificates: Generally, the genuine teapot has the certificate written by the manufacturer. Certificates are usually written on rice paper and brush, and calligraphy is very beautiful. This is because calligraphy is a compulsory course for a good craftsman, and the value-added of a good teapot is more reflected in the skills of painting and calligraphy, which is stamped. The signature of the seal is the same as that on the bottom of the teapot. Test the water for the sixth time: pour the water on the real teapot, and no obvious water drops will be formed. Water is a relatively uniform piece, and then it will be gradually absorbed by purple sand in a short time.