The sand grains left on the bottom of a sukodai. These grains of sand were sprinkled to prevent the melting of the base during over-firing. It is often seen on Korean-style tea bowls. Sand is also sprinkled in the saggars during the main firing of porcelain. The sand that remains in the porcelain glaze after firing is also called “sandy plateau” (Sunatakaidai). (The Pottery Anthology)
These grains of sand seem to have been made from the rough sediment that was produced during the water-sieving of the clay.
