In ceramics, metal oxides can be employed to produce metallic and iridescent effects. These are typically done on a third firing, often with reduction atmosphere.
Lustres are micro-thin coatings of metallic substances fired at comparatively low temperatures (e.g. cone 018, 1350F) onto an already-fired glaze surface. They produce metallic and iridescent effects. Common materials used in lustres are metal oxides chlorides of tin, barium, silver and sodium, bismuth subnitrate (even gold, and platinum compounds).
Ceramic Colours and Pottery Decoration by Kenneth Shaw, published by Maclaren and Sons Ltd., London, 1962, reissued 1968.
Lustres by Margery Clinton, published by BT Basford Ltd. London, 1991. This book covers how to make and use lustres.
A method of applying decoration over the glaze surface of ceramics. It can be done before or after the glaze firing.
Production of Lustres by C.L. King