--- imitated, but the unique subtleties of Gu Jingzhou's teapot-making craftsmanship are either impossible for imitators to replicate, or extremely difficult to reproduce with complete similarity. The question of craftsmanship is a highly specialized subject. While the basic teapot-making process is generally similar, the tools and technical methods used by each artisan vary enormously. These differences actually represent the artisans' habitual "hand movements," and the nuances involved are extremely difficult to imitate. For example, each teapot maker typically applies different force and has a different feel when beating clay slabs; the thickness of the clay slabs produced by each person varies, which directly affects the weight of the pot body after forming. Therefore, we often find that the hand-feel weight of teapots made by different makers can differ greatly. Gu Jingzhou's works typically feel neither too light nor too heavy. If we compile cumulative statistics on the weight of authentic pieces, we can discover that Gu Jingzhou's works from the same period and of the same variety exhibit strong consistency. Gu Jingzhou always fired his teapots only once, never refiring them a second time to adjust the tightness of the lid and opening. When the lid is moved left and right on the body, one can still hear a clear ringing sound. Imitations, however, resort to repeated firing and grinding, one-sidedly pursuing the so-called tightness of lid and opening. Additionally, when using a bamboo knife to "push walls and scrape surfaces," the traces Gu Jingzhou left inside the teapot are naturally smooth and flowing—you can sense this is work done with spontaneous ease. Imitations, on the other hand, can be repeatedly pushed and scraped, giving you a sense of tedious meticulousness in the craftsmanship, far removed from the original work. In the authentication process, we must frequently handle and examine Gu Jingzhou's authentic pieces, carefully observing the detailed traces of craftsmanship and experiencing the rigor and naturalness expressed in the maker's habitual hand movements. From this, we can grasp certain patterns. ## 3. Signatures and Seals The identification of signatures and seals is an important method in the authentication process, and therefore forgers have also devoted considerable effort to this aspect, with techniques ranging from precision imitation carving to transferring original seals—methods emerging endlessly. Regarding seal forgery, the carved imitation type is relatively easy to identify. When we compare them with materials from authoritative reference works, we often quickly discover flaws. Original seal transfers, however, are relatively more deceptive and require the appraiser to have very solid fundamental skills to avoid being misled. For transferred seal impressions, you must personally appreciate the metallic and stone quality of the original seal, while using reliably accumulated seal impression reference materials to carefully compare differences in minute details—this too can decisively expose the forgery. In authenticating seal impressions, we must also master some of Gu Jingzhou's seal-using habits, which makes it quite easy to exclude certain imitations or fabricated pieces. For example, seals like "Wuling Yiren" or "Jingnan Shanji" [Text appears to end mid-sentence]