A select catalogue of the Ashmolean's collection of ceramics from the Islamic world from the 9th to 18th century, by James Allen (published Oxford, 1991).
Alkaline glaze: a glaze fluxed with alkali e.g. soda or potash.
Earthenware: a ceramic body made from clay maturing at c. 850-1200 C.
Flux: a substance which determines melting and fusion point of a glaze e.g. lead oxide.
Frit: a pulverised, insoluble glass formed by the fusion (or fritting) of the various materials being used.
Glaze: vitreous (glassy) coating applied to the surface of a pot to make it impermeable or for decorative effect.
Kufic: geometric form of Arabic script.
Lead glaze: a glaze fluxed with lead oxide.
Lustre: a metallic sheen on the surface of a glaze used for its decorative effect (see no. 3 [EA1956.66].
Maiolica: tin-glazed earthenware in the tradition of the Italian Renaissance.
Minai ware: pottery decorated in overglaze colours (see nos. 13-14 [EAX.3102 & EA1956.36]).
Porcelain: a ceramic body made of felspathic clay maturing at c. 1350-1400 C.
Sgraffito ware: ceramics decorated with incised designs under the glaze (see no. 5 [EA1978.1759]).
Slip: a semi-fluid coloured clay used either for coating a pot or decorating it before glazing.
Stone-paste: an artificial ceramic body made, according to the medieval Persian potter Abu'l-Qasim Kashani, from ten parts of ground quartz, one part of ground glass (alkaline) frit and one part of fine white clay. The stone-paste body of sixteenth century Iznik pottery also contained lead-rich frit.
Stoneware: a ceramic body made from clay, harder and heavier that earthenware, maturing at c. 1200-1300 C.
Tin glaze: a glaze (lead- or alkaline-fluxed) opacified with tin oxide.
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