"Early movable metal type printing from the period of the Goryeo Kingdom shows surface tension of the ink, which is a common tendency of liquid on metal surface at rest to shrink into circular liquid drops.
An 87-page book from 1239 is full of Hanja characters printed on hanji, traditional Korean paper made from mulberry tree bark, showing the characteristics of movable metal type printing."
http://www.koreaherald.com/view.php?ud=20221028000652
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