chapter 285 On-site treasure appraisal, the inkstone used by Tan Sitong

Du Fei pointed to the surface of the inkstone and explained: "Feng Ang, do you know what this is? This is stone skin. It is a fake shell made by others." Upon hearing this, the mother-in-law's old classmates, namely Zhang Zhi and others, all understood what Du Fei meant. "You mean, someone made a fake shell to wrap the real material?" Feng Ang said in surprise. Du Fei nodded and said: "This layer of stone skin is so lifelike, it must be the work of a skilled craftsman. He spent a lot of...