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Back in medieval times, " I said, "we used oil of vitriol for its healing properties. No doubt that's why Commodus had some in his infirmary. Today we call it sulfuric acid."Meg flinched. "Isn't that dangerous?""Very.""And you *healed* with it?""It was the Middle Ages. We were crazy back then.

Back in medieval times, " I said, "we used oil of vitriol for its healing properties. No doubt that's why Commodus had some in his infirmary. Today we call it sulfuric acid."Meg flinched. "Isn't that dangerous?""Very.""And you *healed* with it?""It was the Middle Ages. We were crazy back then.

Approximate author period: c. 1964 AD · modern

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Attribution & collection notes
Author or tradition
Rick Riordan
Attribution: attributed
Country attributed
Not established
A country attribution does not establish the earliest origin.
Historical period
Approximate author period: c. 1964 AD · modern
Approximate author-period anchor from documented birth year 1964; activity date not established; Wikidata Q212727, https://www.wikidata.org/wiki/Q212727 (accessed 2026-10-08). Not a quotation composition date.
An author lifetime, approximate period or collection date is not necessarily the date when these words were first written or spoken.
Recorded source
Contributor-provided quotation collection

Supplied reference C; CSV row 60850; supplied attribution, independently unverified

A collection's publication date can be later than the words it records.