Yohen, which translates as changed by the fire/flame or kiln change, refers to changes that happen in the kiln during firing, causing the glaze to run. The build up of ash on the floor of the kiln and the natural glazing process that occurs because of it result in Yohen pots in deep browns, blues & reds.
Japan’s first white glaze, Shino is a mix of ground feldspar & clay. It varies in colour from a thick snowy white through to grey, pink, and orange. A distinctive characteristic of Shino is small pinholes in the surface of the glaze, particularly favoured by tea masters. When applied thinly on iron rich clay bodies the pristine white can turn red as it absorbs the iron oxide. Developed during the Momoyama period (1568–1600), the glaze fell out of favour in the early 18th century when Oribe glaze became more popular. It wasn't until the 20th century that Shino regained its popularity.