Longquan celadon (龍泉青瓷) is a type of green-glazed Chinese ceramic, known in the West as celadon or greenware, produced from about 950 to 1550. The kilns were mostly in Lishui prefecture in southwestern Zhejiang Province in the south of China, and the north of Fujian Province. Overall a total of some 500 kilns have been discovered, making the Longquan celadon production area one of the largest historical ceramic producing areas in China. "Longquan-type" is increasingly preferred as a term, in recognition of this diversity, or simply "southern celadon", as there was also a large number of kilns in north China producing Yaozhou ware or other Northern Celadon wares. These are similar in many respects, but with significant differences to Longquan-type celadon, and their production rose and declined somewhat earlier. Celadon production had a long history at Longquan and related sites, but it was not until the Northern Song (960–1127) period that large-scale production began, and the move of the capital to Hangzhou, close to Longquan, after the start of the Southern Song (1127–1279), was probably important in the great expansion of both quality and production there. Both continued at high levels in the Yuan (1271–1368) and the early part of the Ming (1368–1644) periods. Longquan celadons were an important part of China's export economy for over five hundred years, and were widely imitated in other countries, especially Korea and Japan. Their demise came after they were overtaken in their markets by blue and white porcelain from Jingdezhen. In traditional Western terms, most celadons are strictly counted as stoneware, since the fired clay body is usually neither white nor translucent. In the traditional Chinese classification, which divides pottery into low-fired earthenware and high-fired porcelain, they count as porcelain. Compromise terms such as "porcellanous stoneware" may be used to describe the pieces, and some Western writers consider the wares should be "regarded as porcelains". The Longquan celadons were among the finest of a range of celadon wares produced in China, and led stylistic and technical developments. The celadons were produced in a range of shades of colour, centred on olive-green, but extending to greenish blues (regarded as desirable, but less common) and browns. All these colours come from the glaze; the body beneath is sometimes left partly unglazed as part of the decoration, when it fires to a terracotta brown. The wares are hardly ever painted; decoration comes from the vessel shape