Clay teapots can absorb tea essence. The inner walls need not be scrubbed yet remain free of any odor. With prolonged use, they accumulate deposits, and when boiling water is poured into an empty pot, it still carries the fragrance of tea. In the past, these claims about the benefits of purple clay teapots, though unable to explain the definite principles, were indeed derived from practical use. Purple clay ware falls between pottery and porcelain, belonging to semi-vitrified fine stoneware. Neither the interior nor exterior is glazed. This gives it both a certain mechanical strength and a certain porosity. Therefore, when holding tea, it neither leaks nor lacks good breathability. Combined with careful use, these are the main reasons why tea stored in it does not easily spoil. But things are always dialectical—when we say it does not easily spoil, we do not mean it will never spoil, but rather that it is relatively better compared to other vessels. Because tea leaves themselves are organic matter, under certain conditions they will inevitably ferment and deteriorate. Regarding the accumulation of "tea stains" after use, such that an empty pot poured with boiling water still carries tea fragrance—this is also related to the purple clay's certain porosity. Fourth, the longer a purple clay vessel is used, the more lustrous its surface becomes—jade-like crystalline brilliance, with a warm and elegant aura. *Yangxian Ming Hu Xi* describes this most aptly: "After long use and repeated cleaning, it naturally develops a subdued luster that can reflect one's image." It truly possesses the characteristic of "with age, its color produces luminous brightness." Fifth, it has good resistance to thermal shock. In the depths of winter's coldest month, when boiling water is poured in, it absolutely will not crack due to sudden temperature change. Sixth, the clay transmits heat slowly, so when handling it, one's hands are not easily burned. Seventh, it is resistant to prolonged heating and can be placed over a gentle fire for simmering. When used for brewing, there is no need to worry about cracking. Beyond the above characteristics of the clay's intrinsic quality, the color development effects of purple clay must also be mentioned here. Purple clay is the collective term for red clay (cinnabar clay), purple clay, and Tuanshan clay (Benshan green clay, which appears rice-yellow). These three base clays, due to differences in mining areas and ore layer distribution, and slight variations in firing temperature, produce endlessly changing colors that are intriguing and wonderfully ineffable. In Wu Meiding's *Yangxian Ming Hu Fu* from the Qing dynasty, there is this passage describing: > As for the transformations of clay color > Now dark, now bright > Sometimes grape-like deep purple