There is a signature on the jade double certificate, which will indicate the author's signature, the appraiser's and auditor's signature and which studio it comes from. Jade double certificate refers to jade A cargo certificate and jade collection certificate. Although the appraisal certificate is not an ordinary card, it cannot prove the value of jade.
The figures in antique jade carvings are not necessarily fake, because they were not carved by ancient famous artists or made privately and unofficially by the people, so there is no signature.
Obviously, the jade carving master Zhang Mingke signed a "birthright". Zhang Mingke is a famous jade carving master in China, and his works enjoy a high reputation at home and abroad. His signature is "Mingzhi", which he uses to identify himself in his works.
Wenwan is not someone's signature, but a commodity, that is, all kinds of wenwan, that is, Four Treasures of the Study and his various wenwan. These stationery have different shapes and exquisite carvings, which can be used and rewarded, and become handicrafts in the study and on the case.