1. Author's seal: China's seal of painting and calligraphy. Generally, the number of the author's seals is no more than three, namely, idle seals (at most two introduction seals or corner seals), famous seals (at most two payment places), individual long scrolls and long screens, and the blank in the middle is unsightly. In order to improve the appearance or identify the author of large calligraphy and painting, seals are used.

2, collectors' seals: collectors have a common interest. All the calligraphy and paintings I have collected are stamped with a collection seal, and the emperor's collection seal is mostly a royal view; Generally, most collectors are so-and-so treasures, so-and-so collections, and so-and-so family collections. Some only keep their names-equivalent to collecting stamps and tickets.

3. Expert seal: some valuable antique calligraphy and painting or famous calligraphy and painting, collectors do not get it from the author himself, and often ask calligraphy and painting experts to identify the authenticity. After the expert appraisal, some experts signed the appraisal opinions and signed them (some genuine products only signed), and stamped the calligraphy and painting at the request of the collectors. Therefore, the older the antique calligraphy and painting, the more collectors there are, and the more seals there are.