According to CCTV reports, the reporter randomly bought 15 pieces of teapot and teapot 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 of manganese ions in black pot reached 2.62mg/L, and that of barium ions in blue pot reached 6.39 mg/L. ..
Ma Chong, director of the Chemistry Department of the Testing Center of Shanghai Institute of Materials, said that heavy metals have a high melting point, so it is difficult to volatilize during the calcination of purple clay 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.
Extended data:
Identification and selection of teapots;
At first glance, the texture of the real teapot is fresh and round, the visual effect is sub-smooth, and there are many evenly distributed fine particles similar to metallic luster. The inner wall of some handmade pots has radial lines from the center to the periphery, which belongs to the processing process.
The second touch: 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, you will feel astringent. This is due to the different manifestations of molecular structure.
Three turns: Turn the lid, the lid of the real teapot turns flexibly and smoothly, and makes a slight "silk" or "rustling" sound, while the fake teapot made of clay makes a dull "crack" sound.
Listening 4: Knock on the pot with the lid. Although some people disapprove, it is very effective. The knocking sound of the 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 a very obvious difference is that 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, which is generally written on rice paper, brush and handsome calligraphy. 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 calligraphy and painting, which is stamped. The signature of the seal is the same as that on the bottom of the teapot.
Test water: the water poured on the real teapot will not form obvious water drops, and the water is a relatively uniform piece, and then it will be gradually absorbed by purple sand.
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