|Yellow Iron Oxide||0.50|
The secret to getting a good blue celadon is using a potassium-rich clay body. When choosing a clay body, first prioritize the flux, looking for either Custer or Mahavir feldspar. Grolleg kaolin has potassium impurities, making it a great candidate when choosing between kaolins as well. Ball mill the glaze slurry for an hour to avoid iron speckling. I prefer this glaze in heavy reduction on porcelain, and it also looks great when fired in soda- or wood-kiln atmospheres.