Wood kiln sweat grade

Most of them are blue-green, glass green, milky white, dark green and yellow-white grades.

The material used in the firewood kiln building itself: it changes at high temperature, forming glassy kiln sweat. For example, the materials used in traditional dragon kilns are basically brick mud made of local clay. Under the action of high temperature, building minerals and wood ash in the kiln melt each other, forming kiln sweat.

The wood used is made of different materials: the fluxing substances contained in the fuel wood used will also adhere to the kiln wall in some cases to form glassy substances.