A younger son of Huizong fled to the south and established the Southern Song as the Gaozong Emperor (1127–1163), but the Ru kiln was now in enemy territory, and production of Ru ware ceased, if it had not already done so.a rather tiny quantity by imperial standards, suggestive of their rarity.Many pieces have a subtle crazed or crackled glaze, though there is some evidence that the most admired are those without this, and the effect was not deliberate.

list dating ru-36

Apart from the last, these other styles would not normally be called "Ru ware", and fall within the range of other contemporary northern ceramics.

The excavations also found sherds of "official" quality, but in more elaborate shapes than found among the surviving whole pieces.

Ru ware is perhaps the first "official ware" specifically commissioned by the imperial court.

Their normal practice seems to have been to review the large quantities of tributary ware given to them, keeping what they wanted and redistributing the remainder as part of their lavish gifts to officials, temples, and foreign rulers, and perhaps also selling some.

Although stoneware by Western criteria (not a category recognised in traditional Chinese thinking), the wares are fired at a relatively low temperature, and are far from fully vitrified, absorbing water at a "fairly high" rate.

Nor is the body free from flaws when examined under magnification.

This is a flat circular ring with an inscription claiming that it was the "first test piece", produced under the supervision of a "Vice-Minister of the Imperial Household" on 9 April 1107.

Always regarded with great suspicion by many scholars, it is now generally agreed to be a fake, probably 20th-century.

The wares were reserved for the Imperial court, with according to one contemporary source only those they rejected reaching a wider market.

The source, Zhou Hui, also says the glaze contained agate, and when the kiln site was located in recent decades it was indeed very close to a site for mining agate, which is very largely composed of silica, a usual component of ceramic glazes.

They can be considered as a particular form of celadon wares.