This is the Chinese term for mountain glaze cracks, or “kaikhata” in Japanese.
There are large and small kaihen. The smallest and finest openings are called “fish pattern,” while the largest and sparsest are called “cowhair,” “willow leaf,” or “crab claw” patterns. These are all descriptive terms for the condition. There are two types of open flakes: artificial and natural. It is thought that the artificial openings began in the Song dynasty (960-1279) at the Gue kiln, and gradually began to be imitated later. (Ya, Yunryusai sesshyi)
