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1 According to Celsus, this substance obtained its name from the person who invented or compounded it; he calls it "Collyrium of Hierax."—B.
2 "Atramenti sutorii, quod chalcanthum vocant." We may presume that this substance was somewhat different from the "atramentum sutorium" mentioned in the last Chapter: the word "chalcanthum" means "flower of copper;" χαλκοῦ ἄνθος.—B. Delafosse identifies it with blue vitriol, sulphate, or hydro-trisulphate of copper. See Chapter 32.
3 See Chapter 31.
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