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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.
Rick Riordan The Dark Prophecy
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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.
RR
Rick Riordan

The Dark Prophecy

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