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Gujeonggupo (九蒸九曝) Black bellflower essence-Gujeonggupo (九蒸九曝) is a traditional method recorded in ancient books that is said to have been used by the Joseon royal family for the health of the king by repeatedly steaming and drying the top-grade medicine bellflower that was placed on the king's sura statue nine times. Domestic bellflower is steamed..