Dragon plate, item used in the Nguyen palace (1802-1945). Phap lam is a kind of product made of enamelled bronze that came into being in Hue since the reign of emperor Minh Mang (1820-1841). Under the Nguyen dynasty, workshops of enamelled bronze wares were set up in Hue, Ai Tu (Quang Tri province) and Dong Hoi (Quang Binh province) adapting to the demands of construction, interior-exterior decoration at Hue Imperial City, ritual activities and household articles in royal residences.