Overglazes are decorative coatings applied to ceramics after the initial glazing and firing process. They are typically used to add color, patterns, or textures to pottery and can enhance the visual appeal of the piece. Overglazes are often made from a mixture of glass and pigments, which can create a glossy finish when fired again. The application of overglazes requires careful technique, as they must be applied to a previously glazed surface. After application, the piece is fired at a lower temperature than the initial glaze firing, allowing the overglaze to bond without affecting the underlying glaze. This process is common in ceramics and pottery making.