Lustre — decorative technique invented by 9th-century C.E. Abbasid potters in present-day Iraq. It involves the application of a mixture of metal salts (typically copper or silver) and clay onto a previously fired and glazed ceramic piece.

During the second firing, the lustre pigment undergoes a chemical transformation, where the metal particles in the pigment fuse with the glaze, forming a thin layer of reflective metal on the surface. This layer interacts with light, creating a captivating play of colours and a shimmering, iridescent appearance.

Lustre coatings are delicate and susceptible to damage from abrasion or exposure to acids. Therefore, careful handling and maintenance are essential to preserve their beauty and longevity.