By YANG YANG | CHINA DAILY | Updated: 2024-05-28 07:41 Items made of Xuan paper are popular tourist souvenirs in Jingxian county, Anhui province. BAI YING/FOR CHINA DAILY In the realm of Chinese culture, the "Four Treasures of the Study", which are ink, paper, ink stone and brush, are not merely tools used by literati but also carriers of Chinese …