Sue ware (須恵器 sueki , literally offering ware) was a blue-gray form of high-fired[clarification needed] pottery which was produced in Japan and southern Korea during the Kofun, Nara, and Heian periods of Japanese history. It was initially used for funerary and ritual objects, and originated from a Mongol people who came from Korea to Kyūshū. Although the roots of Sueki reach back to ancient China, its direct precursor is the grayware of the Three Kingdoms of Korea.
 History and development
The term “Sue ware” was coined in the 1950s from a reference to vessels mentioned in the 8th century Japanese classical poetry anthology Man'yōshū. Previous to this, the terms iwaibe doki (祝部土器) or Chosen doki were in more common use.
Sue ware is believed to have originated in the 5th or 6th century in the Kaya region of southern Korea, and was brought to Japan by immigrant craftsmen. It was contemporary with the native Japanese Haji ware, which was more porous and reddish in color. Sue ware was made from coils of clay, beaten and smoothed or carved into shape, and then fired in an oxygen-reduction atmosphere of over 1000 deg C. The resulting stoneware was generally unglazed, but sometimes displays an accidental partial covering of ash glaze, which melted in drips onto the ceramic pieces' surfaces as they were being fired.
Sue ware was produced in numerous locations around Japan, including southern Osaka prefecture, along the coast of the Inland Sea and parts of eastern Honshū. It was used for the roof tiles of the Kokubunji system of Provincial temples erected in the Nara period. By the end of early 7th century, its position as an elite product was eroded by mass production, and by the imports of the new three-color ceramics from Tang China. By the Heian period, Sue ware had become a utilitarian pottery, and it became the ancestor of a number of regional ceramics.
- Wilson, Richard L (1999). Inside Japanese Ceramics: Primer of Materials, Techniques, and Traditions. Weatherhill, ISBN 0-8348-0442-5.
- Honolulu Academy of Arts (2005). Yakimono: 4000 years of Japanese Ceramics. Honolulu Academy of Arts, ISBN 0-937426-67-9.
- "Pottery - MSN Encarta". Archived from the original on 2009-10-31. "The pottery of the Yayoi culture (300? BC-AD 250?), made by a Mongol people who came from Korea to Kyūshū, has been found throughout Japan. "
- The Metropolitan Museum of Art  "Although the roots of Sueki reach back to ancient China, its direct precursor is the grayware of the Three Kingdoms period in Korea."