Crystalline glazes are characterised by the formation of crystals. They can be either microscopic or macroscopic, either in the glassy matrix or on the surface. The development of crystalline glazes allows us to achieve textural variations and not offer just the standard glossy or matte surfaces that are typically available. They contain materials that crystallise during the cooling period. The crystals usually occur in clusters, frequently covering considerable areas. Often, they are coloured with ceramic oxides such as copper, cobalt and nickel. The development of crystals depends on oxides, which saturate the glaze to form the corresponding silicate; the chemical and physical properties of the solvent glaze; firing and cooling conditions; and application.
