Agricola, Georgius
,
De re metallica
,
1912/1950
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silver, combined with a certain portion of lead, into the cupel, in which way
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the assay is rendered erroneous. </
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<
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>Then take the beads out of the cupel and
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clean them of dross. </
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<
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>If neither depresses the pan of the balance in which it
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is placed, but their weight is equal, the assay has been free from error; but
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if one bead depresses its pan, then there is an error, for which reason the
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assay must be repeated. </
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<
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>If the
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bes
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of coin contains but seven
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unciae
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of
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pure silver it is because the King, or Prince, or the State who coins the money,
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has taken one
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uncia,
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which he keeps partly for profit and partly for the
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expense of coining, he having added copper to the silver. </
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<
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>Of all these
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matters I have written extensively in my book
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De Precio Metallorum et
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MonetĂs.
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<
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>We assay gold coins in various ways. </
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>If there is copper mixed with
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the gold, we melt them by fire in the same way as silver coins; if there is
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silver mixed with the gold, they are separated by the strongest
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aqua valens;
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if there is copper and silver mixed with the gold, then in the first place, after
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the addition of lead, they are heated in the cupel until the fire consumes the
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copper and the lead, and afterward the gold is parted from the silver.</
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<
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>It remains to speak of the touchstone
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37
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with which gold and silver are
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tested, and which was also used by the Ancients. </
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<
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>For although the assay made
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by fire is more certain, still, since we often have no furnace, nor muffle, nor
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crucibles, or some delay must be occasioned in using them, we can always
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rub gold or silver on the touchstone, which we can have in readiness.
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</
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<
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>Further, when gold coins are assayed in the fire, of what use are they afterÂ
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ward? </
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<
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>A touchstone must be selected which is thoroughly black and free
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of sulphur, for the blacker it is and the more devoid of sulphur, the better it </
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