Bidri describes metalwork produced by a technique found only in India: objects are cast from an alloy in which zinc predominates but which may include small amounts of lead as well as copper and tin. The surface of the object is made smooth and a solution of copper sulphate darkens it temporarily for the next stage of engraving. The engraving tools cut the design into the metal, which is then lighter in colour than the darkened surface and enables the pattern to be seen more clearly.

The inlay of gold and/or silver wire on the blackened surface is called bidri after Bidar, a town of its patronage and production for nearly 300 years in the Deccan. The inlay process involves sketching the design onto the surface of the object using a kalam or a needle-sharp implement and then engraving and chasing the design with a cheelne-ki-kalam or chisel. This is followed by the chappat-kalam or the blunt-edged chisel for precisely embedding the fine silver or gold wires, previously drawn from a taar-patti having holes of varying diameters, onto the surface. This technique is also called tarkashi.