Abstract
Since the 1920s, nearly six identical versions of an ancient printed book, The Song of Enlightenment with Commentaries by Buddhist Monk Nammyeong Cheon (南明泉和尙頌證道歌), have been found in Korea. Until very recently, they were believed to be woodblock-printed versions from the 13th to 16th centuries using woodblocks carved from the sheets of a metal-type-printed version from 1239. Two of the six versions were once identified to be woodblock prints in the Goryeo dynasty in the 13th century and designated as Korean treasures in 1984 and 2012. In 2021, one woodblock-printed version printed during the Joseon dynasty in 1526, was designated as a treasure of the Metropolitan city of Seoul, Korea. Historians in Korea have been in heated debate over the printing techniques (metal type print for one version or all woodblock prints) and printing dates (or sequence) of the two versions designated as Korean treasures for the last 50 years. It was almost a never-ending debate with struggles and anger among Korean historians due to the very subjective nature of the examination method and decision-making process by consensus. The heated debates in Korea were never brought to the world’s attention, outside of Korea, and are still considered to be a taboo subject in Korea. To conclude this heated debate with direct evidence of metal type printing of the particular version of interests, all six versions were examined by image comparisons and quantitative analyses of inked areas of individual characters, lines of characters, pages and borderlines. All claims against the possibility of metal type printing of the particular version were reviewed thoroughly. Very clear circumstantial and physical evidence for metal type printing of the version designated as a Korean treasure in 2012 was found. The version carries more than metal casting defects and has the smallest inked area (characters with thin strokes) among all six versions. The version of interest was very likely printed using movable metal type in September 1239, as indicated in the imprint, and is definitely the world’s oldest extant book, printed using metal type in Korea in 1239, predating Jikji (1377) by 138 years and the 42-line Gutenberg Bible (1455) by 216 years.
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