Red Clay (Hong Ni)
Located at the bottom of tender mud and mineral layers, the ore rocks are yellow, red, or bluish yellow. After firing, they become dark red and light red. Red Clay belongs to argillaceous siltstone with a dense block structure with red and yellow tones and contains a small amount of white mica fragments.
Zhu Clay (Zhu Ni)
Zhu Clay is a type of red clay, which is a medium-to-high-grade clay.
The zhu clay is a clay mudstone. The mineral material has a variety of yellow tones. It is a dense block or agglomerated structure with a dense muddy texture. The texture is relatively uniform and fine. Generally, it contains a small amount of fine white mica fragments, which are basically soluble in water and become mud paste.
Zhu Ni has good plasticity, and most of them can be made into light and thin shapes. Due to the different iron content, it will be cinnabar, cinnabar purple, begonia red after firing.
Dahongpao Clay is a type of high quality red clay and contain higher percentage of iron oxide. It has great plasticity and ductility. The mud pieces are not easy to break when bent. The firing temperature is about 1040°C and the shrinkage ratio is about 45% to 55%. After being shaped, it is kiln-fired. The pot body has a very smooth surface with bright red color.
Red Dragon Clay (Hongpilong)
It was formerly known as Wild Red Clay, which is extreme rare. Generally distributed under the yellowstone layer, the mud color is reddish brown, and it is red after firing. Hongpilong has a high content of quartz, more mica impurities, good air permeability. It goes very well with wide range of teas. It is simple and easy to control the temperature, and the longer it is used, the more ruddy.
Jiang Po Clay
It is indeed relatively scarce. It was first discovered in 2005 when the government built Taodu Road.
Jiang Po Clay is produced in the Erlongqiao mine section of the Huanglongshan mining area in Yixing, Jiangsu, right at the junction of "Qinglong Mountain" and "Huanglong Mountain".
After the downhill mud is refined and fired, it is an aged orange-red color. After being raised, it is even more old-fashioned and antique. Kiln temperature: about 1180 degrees. Shrinkage ratio: about 12%.