Biscuit porcelain

Biscuit porcelain,bisque porcelainorbisqueis unglazed, whiteporcelaintreated as a final product,with a matte appearance and texture to the touch. It has been widely used in Europeanpottery, mainly for sculptural and decorative objects that are nottablewareand so do not need aglazefor protection.
The term "biscuit" refers to any type of fired but unglazed pottery in the course of manufacture, but only in porcelain is biscuit or bisque a term for a final product. Unglazedearthenwareas a final product is often calledterracotta, and instonewareequivalent unglazed wares (such asjasperware) are often called "dry-bodied".  Many types of pottery, including most porcelain wares, have a glaze applied, either before a single firing, or at the biscuit stage, with a further firing.
Small figurines and other decorative pieces have often been made in biscuit, as well as larger portrait busts and other sculptures; the appearance of biscuit is very similar to that of carved and smoothedmarble, the traditional prestige material for sculpture in the West.  It is hardly used inChinese porcelainor that of other East Asian countries, but in Europe became very popular for figures in the second half of the 18th century, asNeoclassicismdominated contemporary styles.  It was first used atVincennes porcelainin 1751 byJean-Jacques Bachelier.
Biscuit figures have to be free from the common small imperfections that a glaze and painted decoration could cover up, and were therefore usually more expensive than glazed ones.  They are also more difficult to keep clean.
A popular use for biscuit porcelain was the manufacture ofbisque dollsin the 19th century, where the porcelain was typically tinted or painted in flesh tones. In the doll world, "bisque" is usually the term used, rather than "biscuit".Parian wareis a 19th-century type of biscuit.Lithophaneswere normally made with biscuit.
Although the great majority of biscuit figures (other than dolls) are entirely in white, there are a number of ways of using colour in the technique.
Jasperware, developed byWedgwoodin the 1770s and soon very popular all over Europe, is usually classed as stoneware rather than porcelain, but the style of using two contrasting colours of biscuit was sometimes used in porcelain. TheReal Fábrica del Buen Retiroin Madrid made a porcelain room in theCasita del Principe, El Escorialdecorated with 234 plaques in the style, with a "Wedgwood blue" ground and the design in white biscuit porcelain in lowrelief. These were applied assprigs, meaning that they made separately as thin pieces, and stuck to the main blue body before firing. The plaques are framed like paintings; they were made between 1790 and 1795.The figure by the same factory illustrated here uses elements modelled in a coloured paste, and is all biscuit.
Biscuit porcelain could also be painted with unfired paint rather than the enamels normaloverglaze decorationuses, the lack of a shiny surface giving a strikingly different effect in the best examples. This rare technique is called "coloured biscuit", and is found from the 19th century onwards.  As with 18th-century pieces painted over the glaze, the paint may peel if not well looked after.
A piece could be made with some areas left as biscuit while others are glazed and enamelled in the usual way. AChelsea-Derbyfigure ofGeorge II of Great Britain(1773–1774) leaning on a classical plinth and standing on a high base has only the figure in biscuit.
This part-glazing also occurs in other types of pottery, and for example is very common in theearthenwareChineseTang dynasty tomb figures. Other pieces "reserve" areas in biscuit, by giving them a temporary coating of wax or something similar to keep the glaze off; this is a fairly common feature ofLongquan celadon(which is porcelain in Chinese terms), and also found in Ming dragons.Some Chinese pieces are described as "porcelain with polychrome enamels on the biscuit" – that is, using the normal "overglaze" technique on biscuit, but with no actual glaze,often a revivalist style evoking earliersancaiwares (which were not in porcelain).
The laborious and mostly 19th-centurypâte-sur-pâtetechnique often uses biscuit for at least one of the colours.