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Hydrargyri Oxydum Rubrum
Red Mercuric Oxide
TopicalA mercury-containing compound used historically only in topical, carefully controlled amounts; internal use is unsafe and avoided in modern practice.
This entry is a quick reference for now — we haven't written a full, in-depth write-up for Hong Fen yet.
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This entry is a plain-language reference, not a guide to diagnosis or treatment. Herb names, properties, and categories can vary between texts and traditions — always confirm with a licensed practitioner before using any herb.