The calligraphy work was finished with the artist's seal affixed at the lower corner.
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history
钤 is literary and rarely used alone, surviving in terms like 钤印 ('to affix a seal', common in art and antiques) and 钤记 (an official's small seal). The everyday word for a seal is 印章.
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Literary and specialist — calligraphy, seals, and old documents; not everyday speech.
