The purple clay pot is a specialty of Yixing and is an excellent choice for making tea. But do you know why?What is the magic of the purple clay pot that can make the color, sound, fragrance and taste of tea reach a high level?
In order to uncover the secret of the purple clay pot, we found a few simple experiments done on the Internet with a purple clay pot and a porcelain pot to compare the differences between them.
Yixing purple clay pots and porcelain teapots with similar capacity and shape were used for experiments. Wash with boiling water first, then disinfect in the sun.
Observe the pH value, color, aroma, deterioration and fermentation of tea within seven days.
Through experiments, it was seen that when tea was made in a purple clay pot, the pH of the tea changed from 7 to 5It takes 5 to 4 6 days, and to make tea in a porcelain pot, the pH of the tea changes from 7 to 5 in only 1 2 days5 up.
When making black tea, the tea in the purple clay pot changes from reddish-brown to reddish-brown after 7 days, and the tea in the porcelain pot changes from reddish-brown to black-brown
When making green tea, the tea in the purple clay pot turns from green to brown, and the tea in the porcelain pot turns yellow at first and then turns black-brown.
Food can ferment due to hot flashes and become sour, which is called rancid. The aroma of tea is also related to fermentation. The experimental results showed that under the condition of 15, the black tea brewed in the purple clay pot still had a fragrance in five days, while the fragrance of the black tea brewed in the porcelain pot disappeared in two days, indicating that the fragrance preservation function of the purple clay pot was better than that of the porcelain pot.
The spouts and spouts of both teapots are sealed with sterilized cotton, and after half a month of yellow plum season, open the lids to see that both pots are not moldy. But if both pots have tea, there is a difference, the tea in the porcelain pot quickly deteriorated and became rancid, and there was mold, and the tea in the purple clay pot only deteriorated and rancid after five days.
Through this small experiment, we can see that the purple sand teapot does have excellent properties such as maintaining the fragrance of tea and being mellow, not easy to deteriorate and rancid. This is because the purple clay pot is a porous material with a double pore structure, with fine pores and high density, strong adsorption power, which can absorb and maintain the fragrance of tea for a long time. In contrast, glazed ceramic teapots are less functional in this regard.
Compared with glazed ceramic teapots, the tea juice is not easy to deteriorate and become rancid, and this function stems from the precise and reasonable shape of the teapot itself. The purple sand spout spout is small and the spout and lid fit tightly, the displacement tolerance is very small, and the form of the mouth lid is mostly a gland structure.
However, most of the glazed porcelain pot spouts are facing upwards, and the displacement tolerance between the mouth and the lid is large, and the form of the mouth lid is mostly inlaid with a lid structure. Due to the high precision of the purple sand teapot, the air mixed with molds such as Aspergillus flavus is reduced to the channel flowing into the pot, so the time for the tea to deteriorate and become rancid is relatively delayed.
In addition, the purple clay pot is durable, although its linear expansion coefficient is slightly higher than that of porcelain, but because the inner and outer surfaces are not glazed, there is no concern about the stress of the glaze. The blank contains high aluminum, less glass, and has a certain porosity, which is enough to overcome the stress caused by the difference between cold and hot temperatures. And it can be simmered over a warm fire, and these functions are also beyond the reach of other non-metallic tea sets.
The bottom groove is clear Liufang Palace Lantern - real picture Purple mud is the treasure of Yixing, it has the necessary ingredients for making pottery, such as quartz, clay, mica and hematite. Such an ingredient makes the purple mud easy to pinch, not easy to break, and not shrink too much.
Purple mud has to pass through a 60-mesh sieve, which is too thick and too fine, which will affect the molding and firing. The purple mud that has been sieved must also be refined to smooth the surface of the vessel and form a dense skin. This layer of skin can expand the temperature range of firing, regardless of high or low temperature, it can be sintered, and there can be pores in the vessel.
Therefore, finishing is an important step to connect the purple mud, molding, and firing, so that the surface of the purple sand ware is clean, shiny without glazing, and there are pores without leakage.
After the purple mud is burned to 1150, it becomes the remaining quartz, mica fragments, mullite, hematite, double pores and other things. Moreover, there are more crystals in the purple mud and less glass. These all make purple sand pottery have a good use effect.
Purple mud covered with gray Gaode Zhong - real picture Yixing purple sand pottery is a characteristic ceramic in China, with a history of more than 1,000 years, generations of artists have passed it down, constantly innovated, and formed their own style.
Purple sand mud is a very special mineral material, there are many small stones in it, just like the "bones" in the mud. Purple mud is mixed with clay, mica, and hematite, and it cannot be blistered with water, but must be ground first, and then it can be used to make various purple sand pottery.
The most admirable thing is the purple sand teapot, their shape is simple and beautiful, the lines are smooth and powerful, the proportion is just right, the color is deep and classical, the workmanship is fine and standardized, and there are artistic elements such as metal, calligraphy and painting, seal carving, etc., which is really a work of art. Purple clay pot