Mumyoi-yaki ceramics are baked using clay mixed with "mumyoi" - the iron dioxide found in gold mines. Made on Sadogashima Island.
2. Ito Sekisui 5th
He used two techniques:
A. Yohen. Natural ash glaze. Litteraly means "changed by the fire/flame." Yohen refers to changes in the kiln that cause the glaze to run during firing.
B. Neriage. It is a Japanese term, meaning "to mix," and is applicable as more than one color; a clay body is used.