Many prehistoric and historic cultures used slip as the primary decorating material on their ware, especially in early periods. These include most prehistoric cultures of the Middle East and much later Islamic pottery, cultures in many areas of Africa, most pottery-making cultures in the Americas, early Japanese (and later Onta ware) and much Korean pottery. Much Mycenean ware, Ancient Greek pottery and Ancient Roman pottery used slip, as did pre-industrialized potters in many areas of Europe, including Great Britain, most notably Thomas Toft in the Staffordshire Potteries.4
Later potters mostly combined or replaced the use of slip with ceramic glazes and pigments offering a tougher finish and a wider range of colours. But a variety of slipware techniques were revived by various studio pottery movements from the 19th century on. In England Bernard Leach and in America Mary Louise McLaughlin were among the leaders of these revivals.5
A coating of white or coloured slip (sometimes called by the French term engobe in American English) can be applied to the whole body of the article, or just one part, such as outside or inside of a cup or jug, to improve its appearance, to give a smoother surface to a rough body, mask an inferior colour or for decorative effect. Slip can also be applied by painting techniques, in isolation or in several layers and colours. Sgraffito (or "sgraffiato") involves scratching through a layer of coloured slip to reveal a different colour or the base body underneath. Several layers of slip and/or sgraffito can be done while the pot is still in an unfired state. One colour of slip can be fired, before a second is applied, and prior to the scratching or incising decoration. This is particularly useful if the base body is not of the desired colour or texture.6
Chinese pottery also used techniques where patterns, images or calligraphy were created as part-dried slip was cut away to reveal a lower layer of slip or the main clay body in a contrasting colour. The latter of these is called the "cut-glaze" technique.7
Slipware may be carved or burnished to change the surface appearance of the ware. Specialized slip recipes may be applied to biscuit ware and then refired.
An example of slipware artifact is the Harvest jug.
Media related to Slipware at Wikimedia Commons
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