Mustard Cataplasm (Sinapism)
Tradition: Domestic Medicine | Preparation Type: Plaster | Risk Level: MODERATE
Important Safety Disclaimer
This entry is an archival record of historical medical practices. Do not use, ingest, inject, apply, dose, or substitute this preparation for modern medical care.
Source Verification & Integrity
- Primary Historical Source: Domestic Medicine
- Read Original Text: 📖 Open Local Smart Reader
- Formula Verification: Complete Formula Verified
Historical Formula Card — Modern-Readable Version
Status: Complete Formula Verified Original Formula Name: Mustard Cataplasm (Sinapism) Ingredients: Mustard Seed, Apple Cider Vinegar Original Measurements: Equal parts of mustard-seed and crumb of bread, made into a poultice with vinegar.
Measurement Normalization Table
| Original Term | Modern Approximation | Confidence | Notes |
|---|---|---|---|
| Equal parts | 1:1 ratio by volume (e.g. 1/2 cup each) | exact | Relative ratio measurement. |
Assembly Process
(Assembly instructions withheld or summarized due to safety risks) The historical process describes mixing dry mustard powder with a starchy binder (bread crumbs or flour). Vinegar (or sometimes water) was added to activate the mustard's volatile oils and form a thick paste. This paste was spread onto a cloth and applied to the skin as a 'counter-irritant' to draw blood to the surface.
Storage, Labeling, And Shelf-Life
Must be made fresh immediately before application. The volatile allyl isothiocyanate degrades quickly once wetted.
External Quality Checks — Not Human Or Animal Testing
These checks can help describe identity, cleanliness, strength consistency, spoilage, or physical quality historically. They do not prove medical effectiveness. - Visual Check: The skin beneath the plaster must be checked every few minutes. Severe redness indicates the plaster must be removed immediately.
Known Side Effects And Toxicity Concerns
- Mustard plasters are caustic and will cause severe chemical skin burns and blistering if left on too long.
- They must never be applied directly to bare skin.
What Replaced This In Modern Care
Capsaicin patches, heating pads, and menthol rubs.
Veterinary, Livestock, And Farm Relevance
Mustard is a common crop; vinegar was a standard homestead staple.
Historical Source Citation
Source: Domestic Medicine by William Buchan (1791) - 📖 Read Source Page in Local Reader - 🏛️ Open Book Landing Page
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