Olive-wood ash lye

Statema, B. C. P.

Mineral

Olive-wood ash lye

Lissivio di cenere d’oliva

Known today as: Lye made by steeping the ash of olive wood in river water.
Kind: Mineral
Constituents: potassium carbonate, potassium hydroxide, calcium carbonate
In other databases: Wikidata search
In the Canale glossary: On the Manner of Discerning and Healing the Bewitched, Appendix A: Part Three, Chapters 7–8: The Bath and Fumigations

Revised October 1, 2026: Lore added from texts read in full. Version 1, first published September 25, 2026.

Olive-wood ash lye: what did Canale use it for?

The base of the bath (ch. 7).

Olive-wood ash lye: what does modern science say?

Lye, the alkaline liquor leached from wood ashes, was the old washing and soap-making liquid.

Pharmacognosy & Toxicology

Constituents

potassium carbonate ChEMBLthe chief alkali of wood ash
potassium hydroxide ChEMBLformed in the lye
calcium carbonate ChEMBL

Mechanism

Water leached through wood ash is a caustic alkali, pH 11–13 when strong: it saponifies the skin’s oils, which is why it cleans and why a strong lye burns; in a warm bath, dilute, it is a soap. The alkalinity is the whole action.

Toxic dose

Dilute, a soap; strong, a chemical burn of the skin and eyes.

Standing

The origin of potash and of soap; obsolete as a bath.

Hoffmann, R. C. (2014). An Environmental History of Medieval Europe. Cambridge University Press. Verified against its record · doi:10.1017/cbo9781139050937

Constituent names open the compound’s record at PubChem, and “ChEMBL” beside a name opens its record at ChEMBL, the European Bioinformatics Institute’s database of bioactive molecules. Where a mechanism line was checked against ChEMBL (ChEMBL 37, read 1 October 2026), the check is shown with the measured value and its source paper, or says plainly that nothing has been measured. Doses are as the references give them, for description only; this is not medical advice. Each source carries the result of its check against Crossref, PubMed, or the authority’s page: see Verification.

Olive-wood ash lye: what lore surrounds it?

Of the wood itself Folkard notes that “the club of Hercules, which was made of Olive-wood, took root, and became a tree,” that the club of Polyphemus “was the green trunk of an Olive-tree,” and that “the caps of the priests of Jupiter were surmounted with a twig of Olive.” The Athenians “punished with great severity those who damaged their venerated Olive,” and Pliny “asserts that the identical Olive-tree, called up by Minerva, was standing in his time.”

Sources

[38] Encyclopaedia Britannica, online edition, britannica.com. Articles: Ambergris; Aristolochiaceae; Asafetida; Azurite; Castor-oil plant; Civet; Dragon’s blood; Garden cress; Jet; Kermes; Laudanum; Lye; Monemvasía; Musk; Precious coral; Saltpetre; Sulfur dioxide; Tartar emetic; Tropaeolum. Book, seen in reviews

Folkard, R. (1884). Plant Lore, Legends, and Lyrics, “Olive.” Project Gutenberg #44638. Read in part · the text read

Verification

Checked

October 1, 2026

Passes

Every sentence read against its sources, in the pass over the remaining 343 entries
The Standing line checked against the authority it names (EMA, WHO, FDA, CITES, Commission E)
Every dated or regulatory claim checked by category across the database
Each quotation from the older authorities checked word for word against the text, read in full

Sources

3 cited: 1 read in part, 1 verified against its record, 1 book, seen in reviews.

Corrections

None were needed.

What was checked, how, and what was found is set out on the Verification page. A checked source is one whose record was found; it does not make the entry medical advice.

Cite This Entry

Version 1 · first published September 25, 2026 · last revised October 1, 2026

Chicago: “Olive-wood ash lye.” In Materia Medica, edited by B. C. P. Statema. Version 1. The Thinking Press, 2026–. Last modified October 1, 2026. https://thethinkingpress.org/materia-medica/olive-wood-ash-lye.
MLA: “Olive-wood ash lye.” Materia Medica, edited by B. C. P. Statema, version 1, The Thinking Press, 1 Oct. 2026, thethinkingpress.org/materia-medica/olive-wood-ash-lye. Accessed 8 Oct. 2026.
APA: Olive-wood ash lye. (2026, October 1). In B. C. P. Statema (Ed.), Materia medica (Version 1). The Thinking Press. Retrieved October 8, 2026, from https://thethinkingpress.org/materia-medica/olive-wood-ash-lye

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