In the thirteenth century, Korean potters developed a distinctive method for decorating celadon ceramics. Shallow incisions were cut into the light gray body of the vessel and then filled with white or black clay. After polishing, the decorations remained flush with the surface, as if they had been painted on. The whole piece was then covered with celadon glaze and fired. The new technique was likely inspired by metalwork of the period, in which bronze and other alloys were inlaid with silver and gold.
Posted by Rebekah Pollock Cup, first half of the 13th century. Stoneware inlaid with black and white slip and celadon glaze, Height: 2 13/16 in. (7.2 cm). Brooklyn Museum, The Peggy N. and Roger G. Gerry Collection, 2004.28.45. Creative Commons-BY