Purple sand is stone sand, so it is purple sand, and the mud is coarse. Yixing pottery has a rough sandstone texture. The pores of sand and mud are large, thus obtaining excellent tea-making performance. The shrinkage of green body with stone sand as mud is less than 10%. The processing of purple sand mud is spreading, mashing, sieving, adding water to make raw mud, and beating the mature mud with a mallet for dozens of times. The sandy effect of purple clay is obvious.
Jianshui Tao Wei clay raw materials, shrinkage rate of 20%. Clay is very delicate, so Jianshui pottery adds more tenderness to the soil. Yixing purple sand is hard, Jianshui purple sand is soft. It is necessary to pound the clay into powder, screen out coarse sand, mix it, then put it in a tank and add water to make mud, and stir and wash it; After repeated elutriation, let it naturally condense into mud in a closed state. At this time, the mud is as greasy as grease, without any sand.
Difference 2: molding process
Traditional Yixing purple sand is mostly made of clay tablets and inlaid cylinders. In recent years, mechanical pressing for mass production has also appeared. In terms of modeling, due to the relatively developed handicraft industry in Yixing, many literati participated in the design of teapot in the historical development process, and its modeling system and coordination are far from comparable to the general level of Jianshui Zitao. At least as far as the current situation is concerned, Yixing Zisha still has certain advantages in improving its shape.
Purple pottery has been painted by hand so far. Pull the blank on the pulley to form. The test is more about the master's kung fu. This skill pays attention to eyes, hands and heart. Without long-term accumulated experience, it is impossible.
Difference 3: decorative techniques
Yixing purple sand is mostly plain ware, or carved with yin and yang. A small amount of modern purple sand is decorated with semi-dry mud.
The most brilliant thing about Jianshui Zitao lies in its decoration. The decoration of purple pottery needs the participation of literati, calligraphy and painting, which has a strong cultural atmosphere. This book is not that book, and this picture is not that picture. First, draw on the semi-dry ceramic blank, then buckle the blank along the ink mark, and finally fill the groove with mud of different colors, compact and scrape it flat. This process is called carving and filling. If you want to get the color of ink smudge, you need to engrave it repeatedly. The process of crossing the road must be done by hand, with beautiful paintings, accurate carving knives and careful mud filling. If the painter can do it himself, from painting to engraving in one go, the effect will be more prominent and vivid.
Difference 4: grinding and polishing
Yixing purple sand generally does not need polishing. Because the coarse sand grinding process is extremely rare in purple sand. However, purple sand also has a polishing process called throwing water.
Glaze polishing is a unique polishing process for Jianshui Zitao. Because the clay is delicate, pebbles are polished by hand, and the glaze is not glazed. It can polish a bright and dazzling texture. The same purple pottery has different polishing degrees, and its luster can be divided into fire skin, matte, matte, bright and specular highlights.
Difference 5: Different cultures.
Yixing purple sand has flourished for hundreds of years, located in the Central Plains, with profound historical background, heavy equipment and exquisite craftsmanship.
Jianshui has been a famous literary country since ancient times, and the decoration on pottery can better express the charm of Chinese painting. The color of Gu Zhuo is changeable.