Agricola, Georgius
,
De re metallica
,
1912/1950
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<
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>A—AREA. B—WOOD. C—ORE. D—CONE-SHAPED PILES. E—CANAL.
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same ore is soaked with water and smeared over it and beaten on with shovels;
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some workers, if they cannot obtain such fine sand, cover the pile with char
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coal-dust, just as do charcoal-burners. </
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>But at Goslar, the pile, when it has
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been built up in the form of a cone, is smeared with
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atramentum sutorium
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rubrum
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5
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, which is made by the leaching of roasted pyrites soaked with water.
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>In some districts the ore is roasted once, in others twice, in others three times,
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as its hardness may require. </
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>At Goslar, when pyrites is roasted for the third
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time, that which is placed on the top of the pyre exudes a certain greenish,
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dry, rough, thin substance, as I have elsewhere written
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6
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; this is no more
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easily burned by the fire than is asbestos. </
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>Very often also, water is put on
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