Detection of Surface-Silvering and Near-Surface Silver Enrichment on AD 253/254 Bosporan Staters by Electron Probe Micro-Analysis

M. G. Abramzon; Абрамзон М. Г.; Yu. Yu. Efimova; Ефимова Ю. Ю.; N. V. Koptseva; Копцева Н. В.; D. A. Gorlenko; Горленко Д. А.; I. A. Saprykina; Сапрыкина И. А.; T. N. Smekalova; Смекалова Т. Н.

doi:10.31857/S1028096023100023

Detection of Surface-Silvering and Near-Surface Silver Enrichment on AD 253/254 Bosporan Staters by Electron Probe Micro-Analysis

Autores: Abramzon M.G.¹^,2, Efimova Y.Y.¹, Koptseva N.V.¹, Gorlenko D.A.¹, Saprykina I.A.², Smekalova T.N.³
Afiliações:
1. Nosov Magnitogorsk State Technical University
2. Institute of Archaeology
3. Crimean Federal University named after V.I. Vernadsky
Edição: Nº 10 (2023)
Páginas: 96-102
Seção: Articles
URL: https://rjmseer.com/1028-0960/article/view/664497
DOI: https://doi.org/10.31857/S1028096023100023
EDN: https://elibrary.ru/TGDHYS
ID: 664497

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Resumo
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Resumo

The article deals with the results of the EPMA investigation of surface of two groups of AD 253/254 Bosporan staters minted in the names of Rhescuporis V and Pharsanzes. It was found that a special silvering technique was used for each group. In the Phescuporis V’s coin production, depletion-silvering was executed by first tempering and oxidizing the flan, then attacking it with organic acids before striking. No silver coating was revealed on his coins. Meanwhile Pharsanzes staters have a silver coating with a thickness of up to 10 µm. The elements chlorine, calcium, sodium and magnesium that were first revealed in the surface layer suggest the use of a special paste for silvering the coins of this king. Its components could be chlorides of silver, sodium, ammonium, mercury, potassium hydrogen tartrate and chalk as a thickener. Both techniques for silver surface enrichment of coins were common practice in the Roman coinage from the late third to beginning of the fourth century AD.

Palavras-chave

natural science methods in archaeology, metallography, EPMA, coin alloy, surface-silvering of ancient coins, Bosporus, staters.

Bibliografia

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