出典の根拠 Tobunken's 彩色DB records 白緑 (pale malachite) in Nara-period documents; CAMEO also catalogs it.
関係 白緑 is the finely-ground, lighter grade of malachite (緑青), used for paler greens in painting.
注意 Mineral pigment context only; whiteness depends on grind, so the HEX is an approximation.
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