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Ancient objects made of noble metal alloys, that is, gold with copper and/orsilver, can show the phenomenon of surface enrichment. This phenomenon isregarding the composition of the surface, which has a percentage of gold higherthan that of the bulk. This enrichment is obtained by a depletion of the otherelements of the alloy, which are, in some manner, removed. This depletiongilding process was used by pre-Columbian populations for their 'tumbaga', agold-copper alloy, to give it the luster of gold.

Depletion Gilding: An Ancient Method for Surface Enrichment of Gold Alloys