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T. Y. LI
Sung (907-1280 A.D.) and Yuan (1280-1368 A.D.) periods. The size of official seals became very big, over three inches square, and the writing became most unconventional.
The only interesting point during the Sung and Yuan periods is the development of signature seals 私印 and commercial seals 商業印.
The signature seals of the Sung Dynasty consisted of only one signature, but that of the Yuan Dynasty consisted of a surname with a signature below it; apparently this type of personal seal was very popular during the Yuan period. Occasionally Mongolian characters were found on these seals. At about the same time there was a considerable intercourse on the Chinese North-western border with foreign traders. It is obvious that these people were not well versed in Chinese writing, and even less so in Chinese seal characters. A peculiar type of seal came into existence. Each seal was made with an individual picture design incorporated with Chinese or Mongolian characters. These picture designs were most artistic. I have been able to collect about fifty of these specimens from different books on seals. It is a type of seal which so far has escaped the attention of seal engravers. I believe they were used by illiterate tradesmen who could recognize a picture design better than the different characters. Pure pictorial seals without any writing at all were found even as early as the Chou and Chin periods. These seals had no writing and their pictorial designs are most simple but beautiful.
Two new developments that took place in the Sung Dynasty (907-1280 A.D.) are worth mentioning. One is the publication of books on seal impressions 印譜, the other is the introduction of porcelain seals,
During the Ming Dynasty (1368-1644 A.D.) many scholars became interested in seal carving. They studied the Han seals and ancient calligraphy, and there was a renaissance in the art of seals. The reason for this advancement was caused by a great discovery made by a seal engraver by the name of Wong Mien who lived at the end of Yuan and the beginning of Ming Dynasty. He introduced soft stone to make seals. This method soon became very popular because the texture of soft stone makes cutting very easy. From that time scholars were able to engrave their own seals and the art of seal-making was revolutionized.