Answer the three questions raised by Tao you yesterday. If you have any questions, you can also ask them in the message area. Let’s discuss them together.
1. How did the ball jug come from? Why is it called duoqiu?
A: many pot friends don’t understand why a pot is called “duoqiu”. They don’t understand what it means.
As a matter of fact, duoqiu is based on the shape of the lotus seed pot, which removes the ear under the lotus seed pot. Later, Feng Youting and Cheng ShouZhen raised the neck of the pot, the lid was more close to the semicircular shape, the button was more round, and the big circle of the pot body was added, which was like three stacked balls.
As for the reason why it is called “duoqiu”, it is because the word “duoqiu” has the meaning of continuous stacking. Therefore, the pot with three balls stacked together is named “duoqiu pot”.
2. What are some white substances in the mouth of purple pottery? Is it harmful?
A: the white material is alumina, a common metal oxide. Almost every piece of purple pottery will be coated with a layer of aluminum oxide powder before firing, in order to prevent the lid and mouth from sticking together in the process of high-temperature firing.
Most of the alumina powder will be grinded off in the whole process after firing, and some of it will remain on it. But you need not worry, alumina is very common in life, is harmless. Some aluminum tableware long-term contact with the air, the surface will produce a layer of alumina.
3. What is the shrinkage rate of Jianshui purple pottery?
A: compared with other ceramics, the content of silicon and aluminum in the clay of Jianshui purple pottery is relatively small, and its plasticity and high-temperature resistance are relatively low. Before and after firing, the shrinkage ratio of the main dimensions is about 14% ~ 18%. Improper drying and roasting methods will cause cracks and deformation of the ceramic body.