At Nizamad in Azamgarh district a specialised lustrous black pottery is made. It is rubbed with a special oil and then double fired. Floral and geometric designs are etched on the surface. The block surface with its silvery design has an uncanny resemblance to the bidri metal ware, the matt black of the base offset by the silver sheen of the designs. The deep, black colour is obtained by mixing the local clay with mustard oilseed cake. The silvery ornamentation on the pottery is done by rubbing an amalgam of mercury and tin into the etched and baked patterns on the pots, thereby producing the silvery tracery.. The products made include vases, cups and saucers, water jugs, surahis, plates, jars, and flower pots.