Particles appear in the burning red porcelain firewood.

Black iron will appear on the surface of the teapot after firewood burning, which is generally pure sand, or has a high sand content. When the teapot is fired in the kiln, it shrinks as a whole, and some slightly larger particles burst due to the sudden change of temperature difference between inside and outside, and there is no buffer around the particles.

Extended data:

Wood burning is popular now, and there are a lot of wood burning in the market. I'll talk about it today. Please correct me if it is wrong. First of all, make clear the first concept: firewood burning will not change the characteristics of purple sand, that is to say, as long as you take it to the firewood kiln to burn a real teapot, it will still be a teapot after leaving the kiln. The double-hole structure of purple sand still exists, and the sense of sand will not disappear. The so-called wood burning is to improve the vitrification of purple sand particles through high temperature. In fact, some pot surfaces with high temperature will look brighter and have better water color than those with low temperature, because the crystallization degree of sand body is higher at high temperature. In addition, the charm of firewood burning is that the kiln is the same color and the kiln is colorful. Because the temperature of eating is uneven, the ash drops, and the pot turns kiln color after high-temperature wood fire, which is exactly what people want to pursue in this way. Second, the wood-burning pot can be raised. Of course, there is a premise that you must burn the real raw ore purple sand. If cultivated, it will be wrapped in pulp and hung with porcelain, which is as beautiful as jade.