出典の根拠 Tobunken's 彩色DB records 朱沙/朱砂 (cinnabar, HgS) with Shōsōin-document citations.
関係 Cinnabar/vermilion is the mineral basis of 朱色; period texts call both natural and synthetic forms shu/shusa.
注意 Mineral pigment context only; grinding fineness shifts the hue, so no single HEX is authoritative.
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