Agricola, Georgius, De re metallica, 1912/1950

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              months to the air in order to soften it, it is thrown into vats and dissolved.
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              <s>After this the solution is poured into the leaden rectangular pans and boiled
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              until it condenses into alum. </s>
              <s>The pyrites and other stones which are not
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              mixed with alum alone, but which also contain vitriol, as is most usually the
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              case, are both treated in the manner which I have already described. </s>
              <s>Finally,
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              if metal is contained in the pyrites and other rock, this material must be dried,
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              and from it either gold, silver, or copper is made in a furnace.</s>
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              <s>Vitriol
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              11
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              can be made by four different methods; by two of these methods </s>
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