Brilliant blue-colored glazed vessel made after cobalt was added. The patterns of plant surrounded by Arabic characters and decorative ribbons. The iridescent glaze is a representative Islamic pottery with white tin glaze as the base, metal oxide as the pattern, and low temperature firing with reduction flame. In the late 11th century, the Seljuk Dynasty went on a western expedition and trade between the East and the West flourished. Influenced by China, Islamic pottery ushered in its peak period. At that time, Saveh was one of the central areas of pottery industry, producing a large quantity of glazed pottery of high quality.