Yue ware

Yue ware or Yüeh ware (Chinese: 越(州)窯; pinyin: Yuè(zhōu) yáo; Wade–Giles: Yüeh(-chou) yao) is a type of Chinese ceramics, a felspathic siliceous stoneware, which is characteristically decorated with celadon glazing. Yue ware is also sometimes called (Yuezhou) green porcelain (Chinese: (越州)青瓷; pinyin: (Yuèzhōu) qīngcí) in modern literature, but the term is misleading as it is not really porcelain (on Western definitions) and its shades are not really green. It has been "one of the most successful and influential of all south Chinese ceramics types".

The wares covered by the term have been gradually reduced; initially used for a wide range of early celadons with a grey body, it was first made more specific to refer only to wares from north China, and then later only to those from the Tang dynasty onwards, and sometimes to restrict it "to the finest quality wares of the ninth and tenth centuries".

Yue ware was fired in dragon kilns. The Yue glazing was an ash glaze, made with a recipe using wood ash and clay, and possibly small amounts of limestone. Firing temperature is thought to have been about 1,000°C or slightly higher. The color of the glaze ranges from grey to olive to brown. Yue ware is considered as the ancestor of Song celadon ceramics.

...
Wikipedia