Question 1: is it better to cast light or not?
A: at present, the grinding degree of Jianshui purple pottery is from low to high, such as not grinding to retain fire skin, sand blasting to remove fire skin, sub gloss, sub bright, bright light, etc. As for the choice of effect, it is largely decided by personal ideas, or will be decided according to the effect of the work. It is not to say that low grinding degree is not necessarily good, but high grinding degree is certainly good.
Although personal ideas are the main reason, there are still some similarities between different types of works. For example, teapots and teacups are usually polished to a matte finish, which is convenient for soaking. The number of bright teapots and teacups is small. Tea pots, water tanks, and appreciation utensils do not involve the level of “cultivation”. In fact, the light is better, which is convenient for dust removal and management, and can also reflect the clay characteristics of purple pottery. However, because the lighting effect is time-consuming, laborious, costly and risky, it is still common Choose a matte effect.
Question 2: is the clay of porcelain the same as that of purple pottery?
A: totally different.
The clay of porcelain is kaolin, which is white and fine, and has good plasticity and fire resistance; purple clay is a kind of multicolored mud in Jianshui, which is as fine as plaster, with strong viscosity and poor plasticity, and its fire resistance is not as good as kaolin.
Question 3: how to operate the red effect of Jianshui purple pottery?
Answer: the specific operation and relevant data of oxidation firing are as follows: chimney baffle is adjusted between 20% ~ 40%, pipeline pressure gauge is adjusted between 0.04 ~ 0.06, all burner airlocks are gradually opened to the maximum, and the maximum temperature is 1140 ℃ and maintained for 5 ~ 10 minutes. The temperature difference between the upper and lower thermometer is 0 ℃ ~ 20 ℃, and the color of finished product is dark ochre (collectively referred to as red) after cooling.