Blue Vitriol Classic Formulas — Natural Herb Library

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Induces vomiting to expel thick phlegm or recently ingested toxins - a drastic emergency use reserved for severe phlegm obstruction of the throat, chest, or upper body.
Resolves toxicity and clears putrid tissue - traditionally applied to mouth sores, severe gum disease, throat lesions, and toxic swellings.
Dries dampness and corrodes pathological accumulations - especially in external preparations for ulcers, erosions, and stubborn local lesions.
Promotes tissue regeneration after removing necrotic or infected material - a classical logic behind its inclusion in throat and oral powders despite its harsh nature.

Dan Fan San (胆矾散) - classical powder traditions using minute amounts of Dan Fan for severe gum, mouth, or throat lesions where corrosive toxin-clearing action is desired.
Er Sheng San (二圣散) - a throat-obstruction formula tradition pairing Dan Fan with Bai Jiang Can to expel phlegm and relieve acute blockage.

Me & Qi describes Dan Fan as sour, acrid, and cold, entering the Liver and Gallbladder channels to induce vomiting, resolve toxicity, dry dampness, remove putridity, and promote tissue regeneration.
Shen Nong Ben Cao Jing historically records this mineral under the name Shi Dan, while later materia medica identify it with copper-bearing blue crystals from ore oxidation.
Yi Lin Zuan Yao states that Dan Fan moves Liver wind, drains Liver fire, and removes toxins, while later commentators warn against using it for cold-constrained throat presentations.