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Book VII: Ore Testing

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BOOK VII.                                              223
the metal from slag ; and in the same way the smelter, as soon as the metal
flows from the furnace into the forehearth, pours in cold water and takes the
slag from the metal with a hooked bar. Finally, in the same way that gold
and silver are separated from lead in a cupel, so also are they separated in
the cupellation furnace.
It is necessary that the assayer who is testing ore or metals should be
prepared and instructed in all things necessary in assaying, and that he
should close the doors of the room in which the assay furnace stands, lest
Book VII: Ore Testing Page of 673 Book VII: Ore Testing
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