The reason why Shibaicho cups don't lose their ash

When the temperature reaches 1200 degrees or more, the wood ash begins to melt, and the iron in the wood ash and the iron in the pottery embryo melt to form the natural ash glaze. The phenomenon of natural ash falling on the body of Chaiwai cups, after a long time of high temperature of more than 1200 degrees fused into a natural gray glaze, its color is warm, rich layers, rugged and powerful texture.