1, through signature and seal: compare the seal that the author usually uses, whether there will be a signature. The characteristics of the year of the seal and the characteristics of the seal used.
2. Look at the paper, especially the original paper of ancient calligraphy works, which is completely different from the paper of modern printed matter, and the difference is obvious. Judging from the ink color, the ink color of the original calligraphy is different from that of the printed calligraphy.