A simple mark on a product or kiln tool. It is different in purpose from the nameplates of later generations, which are used to distinguish the work of two or more people in a common kiln, and to assert that the work is the work of one’s own. Ibe’s kiln marks are old and famous. These are simple marks such as Matsuba, Igeta, Maru, Chou, and Ju, which can also be found in Seto, Iga, and other old pottery areas. According to Takahashi Ken’s theory, symbols similar to kiln marks are also found on late Yayoi pottery from the Kinai region, but they are not kiln marks. Sue ware also has symbols similar to kiln marks, such as zeros, Xs, pine needles, and wells, which are called hera symbols. By analogy with other types of kilns based on excavations of Seto kiln sites, it seems that kiln seals were applied to pottery until about the Keicho period (1596-16150), after which the practice shifted to inscriptions. However, the practice of marking kiln tools with seals is still practiced today at climbing kilns for communal firing.
