2. The name of Four Treasures of the Study originated in the Southern and Northern Dynasties (420-589), because ancient China literati often used brush, ink, Xuan paper and inkstone, which were four essential treasures in the literati's study.
3. In Southern Tang Dynasty, Four Treasures of the Study refers to Zhuge Bi, Huizhou Li Tinggui Ink, Chengxin Tang Paper and Jiangxi Wuyuan Weilong inkstone.
4. Since the Song Dynasty, Four Treasures of the Study refers to Hu Bi, Hui Mo, Xuan Paper and Duan Yan, which are not only of practical value, but also works of art integrating painting, calligraphy, sculpture and decoration.
5. In 2007, the Institute of Science and Technology History of China Academy of Sciences and China Four Treasures of the Study Research Association declared it as a world-class "intangible cultural heritage" to UNESCO.