• by vinux

Purple sand teapots are not only different in shape and rich in color, but even the surface texture of the same type or mud purple sand teapot is also different. It is relatively easy to distinguish the shape and mud. So what are the reasons for the difference in texture of the same purple sand pot? Summarized as follows:
1. 紫砂壶内部压力:做工细致的紫砂壶表面质感优于一般的紫砂壶,原因是内部的压力更强,因此在釉到出水的过程中可以使泥料更加致密。
1. Internal Pressure of Purple Sand Pot: The surface texture of a carefully crafted purple sand pot is better than that of an ordinary one, because the internal pressure is stronger, so that the mud can be denser during glazing and water-out process.
2. 烧制工艺:不同的工艺对于发挥泥料特性有很大影响,这也造成了不同的表面质感。
2. Burning Process: Different processes have a great influence on bringing out the characteristics of mud, which also causes different surface textures.
3. 添加物:还有一些特殊要求时会添加其他物质来修饰或者处理表面,例如甲壳粉、金丝、兽血之类的,这也会造成表面不同。
3. Additives: When there are special requirements, other substances will be added to decorate or treat the surface, such as shell powder, gold thread and animal blood, which will also cause different surfaces.

Muddy material stale

The longer the clay for purple sand is stale, the warmer and smoother the surface of the pot will be, just like how aged wine smells better. The pot has a modest and warm luster without being too dry, and it is easy to soak and maintain.

Ore purity

The purity of ore refers to the degree of impurity removal in the process of mud making, usually referred to as “mud purity.” The less impure mud will produce a smoother and neater pot surface. Iron and graphite are the main impurities. After high-temperature firing, iron will appear as small black spots on the pot. Graphite is more resistant to high temperatures and is not easy to deteriorate, presenting a small black spot with a tail, especially noticeable in light-colored pots. For example, Zhu Ni pots, because the pot itself is red, the black dots are particularly striking, some pot friends often feel bad about it, little knowing that these dots are also an important sign for judging whether a pot is from original ore.

Grain size number

At the same temperature, the pot with higher mesh number has relatively higher crystallinity; conversely, it has lower crystallinity. Therefore, the pot with higher mesh number gives a more delicate and elegant feeling without obvious granularity; while the pot with lower mesh number has a rougher and bolder character. Generally speaking, the common clay material is usually 40-60 mesh, and sometimes certain amount of coarser or finer material is added to achieve certain effects. The flavor presented by all kinds of mesh numbers depends on personal preference. As they say, everyone has their own taste.

Kongfu with Light Needles

Polishing with a fine needle is an important step in pottery-making. The skill of the potter in using the needle directly affects the quality of the finished product. If the polishing process is done well, the surface of the pots will be smooth and warm; otherwise, it will be rough and granular.

The temperature difference between kilns.

If the kiln temperature is high and the temperature is uniform, then the surface porcelain degree will be high, and the surface will appear to be more shiny and have more texture; conversely, it will look dry and rough.

A good purple sand pot not only needs to have a beautiful shape, but also needs to have good clay. The longer the time of the stale clay, the better the purple sand pot made by it, and the higher the purity of the original ore, the finer the quality of the pot. To choose a good pot, we still need to learn a lot of knowledge to distinguish it.