The teapot is not easy to deteriorate and turn sour. First of all, it benefits from the excellent permeability of purple sand material. Secondly, due to the tight seam of the teapot, the passage of air mixed with aflatoxin into the teapot is reduced, so the deterioration time of tea juice is relatively delayed. This is because the purple sand mud has small shrinkage and the molecules are arranged in scales, so it is not easy to deform after firing; Moreover, the teapot is finely made, the spout and lid can be closely matched, and the displacement tolerance can generally be controlled within 0.5 mm, while the displacement tolerance of the lid of porcelain teapot is generally between 1~3 mm, or even greater.
The linear expansion coefficient of teapot is slightly higher than that of porcelain, but because the inner and outer surfaces are not glazed, there is no problem of stress on the blank glaze. The high alumina content in raw materials makes the teapot have thermal shock resistance and high mechanical strength, which can overcome the stress caused by sudden change of cold and heat. So in the cold winter, the boiling water won't burst. Once the teapot is not used for a long time, forget to pour out the residue and leave an odor. Just soak it in boiling water, and then take it out and immerse it in cold water immediately. Repeatedly, as the pores on the pot wall expand with heat and contract with cold, the double holes on the pot wall can produce displacement when the heat and cold suddenly change, and the odor can be eliminated.
The teapot is not glazed inside and outside, and the material has excellent physical and chemical properties, which can play a very good role in blending tea soup, maximize the tea fragrance and rhyme in tea, keep fresh for a long time, and is not easy to deteriorate. When making tea in a teapot, the tea juice gradually penetrates into the teapot wall, which will bring the effect of harmonizing tea tannins. Moreover, tea leaves will have a moisturizing effect through purple sand, and its extract will not have any adverse effects. Long-term use of teapot will accumulate "tea rust". According to the analysis of Shanghai Institute of Biology, the tea rust contains griseofulvin, which has anti-inflammatory and disinfection effects, so it is unnecessary to deliberately clean the tea dirt on the inner wall of the teapot. Placenta of purple sand is rich in iron and other components beneficial to human body. Often used, it has health care function, so teapot has the reputation of "non-toxic tableware" abroad.