Thailand, along with Annan, is one of the few Southeast Asian countries that produced its own ceramics under Chinese influence, and it is estimated that its pottery industry was started in 1294 by potters brought back from China by King Somdet Baromcha. Kilns were located in Sokotai, Karon, Suvankalok, and Sakkanalai, and the one in Suvankalok, known in Japan as Sungkolok, has long been familiar. The ceramics are divided into the following four types. (1) Celadon glazed gray semi-porcelain vessels, commonly called Sung Hulok celadon. The glaze has a greenish color with a high glass content and is thickly applied, resulting in a large amount of penetration. Many of these flat bowls were about 30 cm in diameter, and jars, bowls, bottles, bowls, goji, and sake cups were produced in fairly large quantities and exported not only domestically but also to Indonesia. The glaze quality and style of this ware suggest that it was copied from Longquan ware of the Southern Song dynasty in China, and it is estimated to have been made in the 13th or 4th century. The production area of celadon seems to be limited to Suvarngarok. (2) Black glaze: This is the most common type of pottery produced in all kilns, with an iron glaze giving it a black or candy-colored skin. Most of them are daily tableware such as large jars, pots, bottles, bowls, cups, and lids, and some of them have engravings under the glaze. (3) White wares covered with a permeable white glaze made of phosphoric acid, known as hagi glaze in Japan, are almost identical to the first two types of wares. (4) Iron painting on white ground, popularly known as Sung-glazed wares, in which fine arabesque or lattice patterns are painted in iron sand and covered with a cloudy gray glaze. The most common types of vessels are lids, including small jars, kendi-shaped water jars, bowls, and plates. The most common type is from the Suvankalok kiln, but the Sokotai ware with fish patterns painted in the Koryo style is also well known.
