The purple clay pot, as a treasure in tea culture, is highly respected. If you are a tea connoisseur, owning a real purple clay pot is undoubtedly your ultimate pursuit. The purple clay pot is carefully made of coarse sand mud, and the choice of this mud is the ultimate pursuit of quality. It is made of high-quality sand with no earthy taste, and after many processes, it is recognized as the most suitable material for making teapots. Holding a purple clay pot in his hand, it seems to be one with nature. It is not only a tool for making tea, but also the soul of tea art. Using a purple clay pot to make tea, the aroma of the tea leaves is perfectly released without any masking or stale taste. This is the charm of the purple clay pot, which perfectly locks in the aroma and color of the tea with its unique double pore structure, so that each cup of tea exudes a mellow fragrance. 
The unique function of the purple clay pot - "Titian, Xiangxiang", is due to the special properties of its clay. Purple sand mud is a porous material, and these tiny and dense pores have an extremely strong adsorption capacity. They are able to absorb the aroma of tea leaves like a sponge and maintain this aroma for a long time. In contrast, teapots made of other materials, such as glazed ceramic teapots, perform much less well in this regard. This double pore structure is closely related to the quartz composition in the purple sand mud. The reason why purple sand pottery gets its name "purple sand" is because its color shows a purple hue;"Sand", on the other hand, refers to its unique properties. The word "sand" here has two meanings: one refers to a single pure quartz grain, and the other refers to a complex formed by mixing quartz and other silicate particles. Usually when we talk about purple sand pottery, we refer to the latter. 
During the production process, when the mud is fired, the carbonate will first decompose, releasing carbon monoxide and carbon dioxide gases, forming bubbles. Some of these bubbles are connected to each other in the soil, while others are closed, thus forming a fine "chain of stomatal groups", which makes the pottery open. In a complex of quartz and silicate particles, air bubbles are clogged between the particles, making the existing voids unable to communicate with each other, resulting in closure. This structure in which both open and closed airways coexist is called a "bubble structure" and is also commonly known as a "double stomata". 
By looking at the cross-section of the purple sand pottery after firing through a microscope, we can see the open pores between the conglomerates, which are large, and the gas can enter and exit through them, forming a unique tea aroma. At the same time, the purple clay pot can also maintain the temperature of the tea, making the tea soup more mellow. Making a perfect purple clay pot requires multiple firing and exquisite polishing to achieve the ideal sintering temperature and texture. In this process, every detail must not be sloppy. The final purple clay pot should be delicate in the hand, natural in luster, tough in texture, and good in durability. Such a purple clay pot not only has practical value, but also is a handicraft full of artistic sense.