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Surface Silvering and Silver Enrichment of the Surface Layer of AD 253/4 Bosporan Staters: Electron Probe Microanalysis Data
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Surface Silvering and Silver Enrichment of the Surface Layer of AD 253/4 Bosporan Staters: Electron Probe Microanalysis Data
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Journal Article
Surface Silvering and Silver Enrichment of the Surface Layer of AD 253/4 Bosporan Staters: Electron Probe Microanalysis Data
2023
Overview
The paper presents the results of electron-probe microanalysis of the surface of two groups of Bosporan staters dated AD 253/254 that were minted in the names of the kings Rhescuporis V and Pharsanzes. For each group, a special technique to enrich the surface of the coins with silver is established to be used. In the Rhescuporis V coinage, depletion silvering is first carried out by tempering and oxidizing the coin blank, followed by its treatment with organic acids and forging. There is no silver plating on his coins. A silver coating with a thickness of up to 10 µm is revealed on Pharsanzes staters. The chlorine, calcium, sodium, and magnesium elements that are first discovered in the surface layer suggest the use of a special paste for silvering the coins of this king, the components of which could be chlorides of silver, sodium, ammonium, mercury, potassium hydrotartrate, and chalk as a thickener. Both techniques for enriching the surface of coins with silver are also used in Roman coinage in the second half of the 3rd–early 4th century AD.
Publisher
Pleiades Publishing,Springer Nature B.V
Subject
/ Chalk
/ Chemistry and Materials Science
/ Chloride
/ Chlorine
/ Coins
/ Copper
/ Electron probe microanalysis
/ Silver
/ Sodium
