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The character 藍 (lán) originally depicted plants used for making indigo dye in ancient China. Its composition shows 艹 (grass/plants) radical over 監 (to supervise/watch), suggesting the supervised process of fermenting plants to produce the prized blue dye. Over time, it evolved from complex bronze script forms to the modern standardized character, maintaining its core meaning related to the indigo plant and the color blue. Arrived in Japan: The character 藍 likely arrived in Japan during the Yayoi period (300 BCE - 300 CE) or early Kofun period (300-538 CE) through cultural exchange with China and Korea, becoming established in the Japanese writing system by the Nara period (710-794 CE). It appears in early Japanese texts and place names, and was used in compounds like 藍色 (ai-iro) meaning indigo color, reflecting Japan's own rich indigo dyeing tradition.