Yixing teapot - black dots,Blog
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Yixing teapot - black dots
Yixing teapot - black dots

why black dots on yixing pots

Yixing clay is of minerals such as iron, silicate, manganese etc..and it differs depending on where

silver (mica), white (silica), black (mangaese or iron)

silver dots are often found on Mt. Huanglong clay, from deep inside, almost never found on Zhuni. It's one way I discern Huanglongshan Hongni from Chuanbu or Zhaozhuang Hongni and Di Cao Qing from Zini. Old factory-1 Hongni had many silver dots :)

white dots are helpful to discern whether it contains chemical oxide or not, for example, CR (cultural revolution) clays are known for white dots then after late 70's (started using oxide powder) they are gone but sometimes not, on early-Qingshuini. It could be used for Zhuni as well.

black dots can be used helpfully as well, and it has many types about it. If it's one sole big dots, it could be sign of being fired at wood-kiln or made during early-day (before 80's). If it's numerous dots, it could be manganese. If it's on red clay, then I think could be of iron.

2. dry or glossy

It is as well very important factor to discern. Red clay, Xiao Mei Yao Zhuni, Hu Fu Zhuni, Nenni have drier surface than Huanglong/Zhaozhuang Zhuni and Mt. Huanglong old Hongni has dry surface than other Hongni. Di Cao Qing is known for oily skin too. Kiln also affects it. Gas kiln and late factory-1's famous tunnel kiln have known for firing pots oily :)

3. weight

I personally like heavy clays (Tie Sha ni, Zhuni, Di Cao Qing, etc). They didn't disappont me. Many times heaviness comes from density and amount of iron. Zhaozhuang Zhuni a bit heavier than other Zhuni, also Di Cao Qing and other clay from deep inside shows this character.

4. color (water color-水色)

Definately important factor. The Chinese call it water-color, it's a color tone that turns brighter to sunshine or light. No other Zhuni has brighter and stronger orange tone than Zhaozhuang golden Zhuni (aka Zhu-Hongni). Some low-quality Ben Shan Luni, Mt. Huanglong Lao Hongni, Xiao Hongni Nenni don't have this character. Kiln also affects it, old-time wood-kiln was known for firing pots darker, historically, best kiln for color is known as factory-1 tunnel kiln (used during 70's to 90's)

5.softness

Good clay all is soft :P


these are factors ppl use to check up but not all-the-way right :) but I think it could be more helpful than sand-clay 泥沙 way, latter is what potters and clay-makers use often


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