LOGOI

Passage

Vitruvius, De Architectura 7.9.5

lat vitruvius phi001 perseus lat1

Vitiatur minium admixta calce. itaque si qui velit experiri id sine vitio esse, sic erit faciendum. ferrea lamna sumatur, eo minium inponatur, ad ignem conlocetur, donec lamna candescat. cum e candore color mutatus fuerit eritque ater, tollatur lamna ab igni, et sic refrigeratum si restituatur in pristinum colorem, sine vitio esse probabitur; sin autem permanserit nigro colore, significabit se esse vitiatum.

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