A decorative technique in which a vitreous pigment of metallic oxide is mixed with finely powdered glass is applied to the surface of a metal--normally bronze, copper, silver or gold. This glass composition adheres to the metal through fusion under very high temperatures. The color of the enamel and its degree of transparency depend on the metal oxides that exist in the glass and the temperature at which the glass melts and coheres to the surface. Popular during the mid-Victorian period was a solid black, blue, or white enamel used to fill engraved designs. See Arts and Crafts, champlev?, cloisonn?, faberge, filigree enamel, guilloche, and plique-a-jour.
Glass turned to powder and colored by adding metal oxides. The glass is suspended in water, placed in designated areas on metal and melted in an oven. The final product can be either opaque or transparent.