出典の根拠 Tobunken's 彩色DB records 胡粉 (shell white) in Nara-period inventories such as the Hōryū-ji records.
関係 胡粉 is the calcium-carbonate shell white that gives 胡粉色 its name and is still made for nihonga today.
注意 Material context only; whiteness depends on shell source and grind, so the HEX stays an approximation.
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