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Depletion Gilding: An Ancient Method for Surface Enrichment of Gold Alloys
Journal: Mechanics, Materials Science & Engineering Journal (Vol.2, No. 1)Publication Date: 2016-01-11
Authors : Amelia Carolina Sparavigna;
Page : 1-1
Keywords : Gilding; Depletion Gilding; Gold-Copper Alloys; Tumbaga; Gold-Silver-Copper Alloys; Electrum; Archaeological Artefacts; Gold-Copper nanoparticles; Nanoporous Gold;
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Abstract
Ancient objects made of noble metal alloys, that is, gold with copper and/or silver, can show the phenomenon of surface enrichment. This phenomenon is regarding the composition of the surface, which has a percentage of gold higher than that of the bulk. This enrichment is obtained by a depletion of the other elements of the alloy, which are, in some manner, removed. This depletion gilding process was used by pre-Columbian populations for their “tumbaga”, a gold-copper alloy, to give it the luster of gold.
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Last modified: 2016-06-23 21:07:38