Let's talk about other kinds of mud:
① Satin mud: In the ancient teapots we saw, there were many kinds of beige satin mud with different shades, some were yellow, some were red, some were blue and some were gray, and the particles contained in them also had several meshes. In fact, modern orthodox satin mud is made of Huanglongshan green mud mixed with a small amount of purple mud, and the standard ratio is 85: 15. Changing their proportions will lead to the change of their final color effect. It is reported that there is a "Tuanshan Mine" in Dingshu Town, where the mud mined is satin mud. However, since I began to study purple mud, I have never seen that "Tuanshan" or "Tuanshan Mine". I think "Tuanshan Mine" may have been a long time ago. Because the soil of this mountain deposit is sandwiched between each other, there are often some inclusions during excavation. The early satin mud was also mixed with green mud and purple mud because of mining, and the proportion was not strict, which led to the inevitable inconsistency of its color. And green mud, like purple mud, can be divided into shades of color and soft and hard texture. Therefore, modern satin mud belongs to mixed mud, not a single variety of mud from a mine. According to the crushing method of green mud, the size of screen determines its sand content and particle size ratio. Due to the low iron content and relatively high titanium content of satin mud, the sintering temperature of satin mud is higher than that of other kinds of purple sand mud, and satin mud made of older mineral materials can only be burned through at 1200℃.
(2) Dark green mud: it is a variety made of single green mud (or a small amount of purple mud can be added), cobalt oxide, chromium oxide green, etc. It is impossible for any mineral without pigment to burn into dark green. During the Republic of China, there was a batch of green mud. It is said that it is made by adding cobalt ore raw materials and chrome green pigment into Benshan green mud at the same time. Although cobalt oxide is not added directly, the principle of adding cobalt oxide is basically the same, but the composition of cobalt ore is more complicated than cobalt oxide. The final hair color is different from the special hue of' Republic of China Green' formed by adding cobalt oxide. Adding cobalt ore to purple mud makes it blue-purple, which is roughly the same as adding cobalt oxide. Similarly, manganese ore can also be used to clear cement and make it purple. As for safety, it should be said that it is more appropriate to add stable oxides refined by reaction.
③ Black material: There are two formulas for selecting materials. One is based on purple mud, and the other is based on green mud or white mud, adding oxidation pigments of chromium, iron, manganese and cobalt, or directly using synthetic melanin to prepare. The black material mixed with purple mud is finally black with purple, which is caused by the high iron content of purple mud. The result of mixing black matter with green mud or white mud is that there is some cyan in black. Although both are black mud, the results are somewhat different. Some people like warm colors of purple and black, while others like cool colors of blue and black. It is impossible to make black mud without adding oxide pigment. The blackness of Shandong black pottery is actually the result of fuel carbon infiltration, so the temperature should not be high, otherwise it will fade, because its raw materials are basically close to white.
(4) Red mud: it is a mud material made of red mud (yellow mud block) and red mud (sandy lump) (red mud is the base material and red mud is the skeleton). It is the strongest and brightest color in purple sand five-color soil, and can be divided into ordinary red mud and vermilion. More specifically, cinnabar is fine red mud. During the Ming and Qing Dynasties, Zhu Ni was always the best material for making sketch pots. Colorful Zhu Ni sketches have always been favored by places where people play with pots and drink tea. Pear peel sand in vermicelli is used as red mud particles with smaller mesh, which are prepared according to the design requirements. Little red mud is the most exquisite variety of purple clay because of its fine and moist, high iron content, low temperature resistance, high density after sintering, vitrification and low water absorption.