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Photos from: An essay on 5,000 years of fire assaying



Cuneiform tablet from ancient Babylon describes a process similar to fire assay.Beads of doré or a semi-pure gold silver alloy inside small clay crucibles.Illustrated page from De Re Metallica; foremost historical book on fire assay.

Precious Metals Assay and Training Institute

After a core sample has been burned away, what is left is a bead of doré, or a semi-pure alloy of gold and silver, that weighed and averaged to determine richness of the sample.



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