2. There is a slight protruding feeling in the real handprint of ancient books, which is the result of the positive plate (especially the first edition) pressing words, while the photocopy plate is printed on the flat plate (whether it is Coptic plate, slate plate or offset plate), and there is no concave-convex feeling.
3. The back of real ancient books will occasionally have the residual hair of a brown brush, and there will never be a copy!
Real ancient books are rarely printed on rice paper. Contemporary photocopied ancient books are mostly printed on Xuan paper, which is a mechanism propaganda.