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Influence of Impurities on the Loss of Precious Metals during Cupellation
about 45 to 55 million years ago
2 oz Cavity is 21/32" X 1-1/4" X 5/16" Deep
Description of Process
Maybe a little less
How To "Assay Manual" Book by Charles Fulton Gold-Fluxes-Silver-Furnace Plans 14 Influence of Impurities on theBy Chas. Fulton, published in 1911, 215 pages, soft bound high qualitycopy of out of print book. Contains the assay mixtures and fullinformation on each step of the assay including some data on assayingplatinum. Fire assays have been the method of detecting gold for thelast 5000 years. Chapters are on tools, sampling, weighing, reduction,crucible assays, cupellation and parting, special methods and errors inthe assay. An advanced book on assaying
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