Abstract
The assaying of gold jewellery before hallmarking is generally carried out on samples scraped from the surface. But the assay result may not necessarily be representative of the bulk composition. Analyses reported here have shown the presence of polishing compound residues on, and just below, the surface of some of the jewellery tested.
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References
P.V.A. Johnson,Proc. 2nd Int. Sem. Sampling and Assaying of Precious Metals, IPMI, 1980, 146–157
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L.E. Samuels,Metallographic Polishing by Mechanical Methods, Pitman, 1967
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The author, now Mrs Helen Marshall, BSc, PhD, carried out this work at Cambridge in 1986. She may be contacted c/o the Editor,Gold Bulletin.
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Royal, H. Polishing compound residues in gold jewellery alloys. Gold Bull 22, 42–47 (1989). https://doi.org/10.1007/BF03214706
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DOI: https://doi.org/10.1007/BF03214706