Dan Fan
CuSO₄·5H₂O (Chalcanthite)
☯ TCM Properties
Induces Vomiting to Expel Phlegm; Resolves Toxicity; Dries dampness and draws out moisture; Removes Putridity and Promotes Tissue Regeneration
Botanical Description
Dan Fan is the traditional Chinese pharmacopoeial name for chalcanthite, a naturally occurring hydrated copper(II) sulfate mineral with the chemical formula CuSO4 5H2O. The crystals are typically a vivid azure to deep sky-blue, forming triclinic prismatic or tabular crystals, often occurring as crusts, stalactitic masses, or efflorescences in the oxidized zones of copper sulfide ore deposits. The mineral is brittle, water-soluble, and has a vitreous luster with a hardness of about 2.5 on the Mohs scale. On exposure to dry air it gradually loses water of crystallization and turns into a pale powdery anhydrous form. In medicinal use the crystals are powdered finely. Copper sulfate is acutely toxic if ingested in any significant quantity and modern internal use is strongly discouraged.
Dosage
| Form | Amount | Frequency | Duration | Population | Notes |
|---|---|---|---|---|---|
| decoction | 6-15g | Daily | — | — | — |
Cultural & Historical Context
Traditional Chinese Uses
Dan Fan (copper sulfate crystals) is a toxic mineral substance used in Chinese medicine primarily as an emergency emetic to induce vomiting when thick Phlegm blocks the throat or when toxic substances have been ingested. It is also used externally as a wash for mouth sores, gum disease, eye inflammation, and skin ulcers. Because of its significant toxicity, it must only be administered by a qualified practitioner in carefully controlled, very small doses and for strictly indicated acute conditions.
Traditional American Uses
None Documented
Important Disclaimer
This information is for educational purposes only and is not intended to replace professional medical advice. Always consult a qualified healthcare provider before using any herbal remedy, especially if you are pregnant, nursing, or taking medications.