Raku is a pottery firing technique first practiced in Japan in the 16th century. Originally, the glazed pots were placed directly a hot kiln, allowed to come to temperature, and removed and allowed to chill quickly.
In the 1940s raku was brought to England and America, and in the late-1950s Paul Soldner developed a western style that is now broadly practiced. In this method, pottery is glazed, loaded into a cold kiln, and fired to a relatively low temperature (about 1,800° F).
The pottery is removed while still glowing hot and placed in a metal container with combustible material, like sawdust. The sawdust starts on fire, the container is covered, the fire is smothered, and the reduced oxygen atmosphere and the fumes from the burning material react with the glaze. The pots are removed from the container and quickly cooled in water. When returned to the air many glazes take on a lovely depth and iridescence that is unique to each piece.
