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The character 朱 originally depicted a tree (木) with a dot or short line indicating the red heartwood or cinnabar-colored core. In ancient China, cinnabar (a red mercury sulfide mineral) was highly valued for its vibrant color and use in rituals, medicine, and as pigment. Over time, the character evolved from showing the specific red part of a tree to representing the color red itself, as well as vermilion and cinnabar. It appears in oracle bone script as early as the Shang Dynasty, showing its ancient origins. Arrived in Japan: The character 朱 likely arrived in Japan during the 5th-6th centuries CE along with the broader introduction of Chinese writing system through Buddhist texts, official documents, and cultural exchange. It appears in early Japanese texts like the Kojiki (712 CE) and Manyoshu (8th century), indicating it was well-established in Japanese writing by the Nara period.