Shanghai Duoyunxuan. Rongbaozhai is an old store in Beijing that sells the four treasures of the study. It has a history of more than 300 years since the establishment of the Nanzhi shop "Songzhuzhai" in 1672, the predecessor of Beijing Rongbaozhai. Shanghai Duoyunxuan, which is as famous as Beijing Rongbaozhai, was founded in 1637 AD on the main street of Hangzhou Prefecture. It has a history of 379 years. Its main business is celebrity calligraphy and painting, four treasures of the study, and rice paper deep processing. It is not only a study shop, A folk art museum and a public art space have also been built.