- by vinux
Zisha pots are pounded or inlaid into shape, starting from a piece of purple sand mud material, carefully crafted by craftsmen into a pot.
Build a wooden bridge across the mud.
After cutting the mud block into strips for making a round body and pieces for making a pot bottom, the “dazi” made of wood should be used to beat on the mud bench to form the desired thickness. There are strict regulations on the angle, force and number of beatings. With just a few beatings, it will reach the desired thickness and its thickness must be consistent throughout. After beating, the molecular structure inside will also be arranged orderly, thus becoming tight.
Pound the body barrel.
Roll the prepared clay strips around a piece of wood to form a tube shape, and fit the joints of the clay strips at an angle. Then, support the inside of the tube with one hand and use a “paddling” tool to beat it from outside, thereby rotating the turntable to change the position under stress. When rolling and beating, both pressing force and turning force should be applied.
The fine processing of ox horn awls
In the process of manual molding, the inner wall of green body is not extruded and still maintains its original granular structure. The factors such as the mineral composition of mud and the accumulation of particles make the inner wall have loose gaps; The surface of the green body will also present particles. With tools for fine processing, the coarse sand particles on the surface of green body can be squeezed into the inner wall to make it smooth and glossy, forming a finer skin layer. The repaired skin layer can be sintered at both normal firing temperature limits, which reduces the channel for air entering into bottle.
After the finished needles were polished, a fine layer of skin was formed on the surface of the blank.
During the firing process of the body, the closed pores within the crystal particles remain unchanged, while the subtle air permeable and water impermeable pores are formed outside of the crystal particles. It is natural and formless in mud material, formed in baking and burning. The internal micro-pore structure is the “aromatic carrier” of purple sand pot. After pinching with a bright needle, the surface of blank body becomes a tight layer with less sand and more mud, and its interior becomes a loose body with uniform sand and mud. It is artificial, formed in blanking and molded in burning. The tight structure layer on the outside is “water-carrying carrier” of purple sand pot. It depends on the skillful work of master’s bright needle to make good water color, and fine processing of bright needle for blank also helps to form double pores.
No glaze is applied on the inside and outside, so it has good air permeability, thus having strong adsorption power. When making tea, the aroma won’t dissipate and the taste won’t lag. No stale smell will be produced after overnight storage and there won’t be any odor when storing for a long time. After long-term use, “tea rust” will accumulate on the inner wall (although this is not hygienic), so that when boiling water in an empty teapot, there will still be tea aroma.
The small bubbles inside the pot body are filled with stagnant air, which is a poor thermal conductor, so it has good heat preservation. It is not easy to burn your hands when you hold it, and it is not easy to crack when the temperature changes rapidly (except for Zhu mud, due to its mud nature, it is not included).