An estimate of the minting method of three silver coins of the 3rd century B.C. through their microstructural study

Pistofidis, N.; Vourlias, Georgios; Dilo, Teuta; Civici, Nikolla; Gjongecaj, Sh.; Σκολιανός, Σ.; Polychroniadis, E.K.

doi:10.1016/j.physb.2010.01.129

Cited by 6 publications

(2 citation statements)

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“…where d -interplanar distance for a given group of "reflecting" parallel crystalline planes in crystal, λwavelength of incident irradiation, θ -an angle between direction of incident irradiation and "reflecting" planes, kan integer, defining the so-called "order" of diffraction (normally k is taken 1, as reflections for higher orders have much smaller intensities), see Figure 1. If the set of all diffraction angles {θ n } is measured, all {d n } values can be calculated using (1). The {d n } set uniquely defines the given crystal.…”

Section: Residual Elastic Stress and Methods Of Coins Manufacturingmentioning

confidence: 99%

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Residual Elastic Stress in Historical Coins as a Criterion for Authentication

Kossolapov¹,

Chugunova²

2021

SJC

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Authentication of coins is frequently presenting complicated problem in numismatics practice. Metal composition only may not be enough to identify forgeries, notably when one deals with noble metals -silver, gold or electron. Isotopic ratios, providing in certain cases information regarding metallic ore source (geographical provenance), require a sample to be extracted for MS-analysis while sampling is not permissible for numismatic material in principle. To solve the problem it becomes crucial, in addition to metal's composition, to establish the method used for a coin's manufacturing, as forgers are rarely realizing or following the method that was used in the original historical production. Conventional visual studying under microscope is not always being enough to understand how the coin was produced while metallographic examination of polished and etched metal samples, which might provide necessary information, is not applicable here for its destructive character. Necessary information regarding manufacturing could have been extracted from residual stress analysis, but, in general, there were very few published works regarding this kind of analysis for coins, and those few did not consider any connection between manufacturing process and residual stress in metal. The expected types of residual elastic stress arisen under historically known methods of coins production (casting in hot or cold mold, striking hot or cold metal) are considered in this work. On this base, non-destructive X-rays diffraction method (Sin 2 Ψ-method) is offered to distinguish between various methods of manufacturing. The results may be applied in museum's laboratory as useful criterion for authentication of coins and medals.

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Section: Residual Elastic Stress and Methods Of Coins Manufacturingmentioning

confidence: 99%

“…It is not possible on practice to extract a sample from a coin for establishing manufacturing method by means of conventional metallographic microscopic examination. In experiments of N. Pistofidis et al [1], that approach was chosen for Greek coins of relatively low value and for scientific purposes only.…”

Section: Introductionmentioning

confidence: 99%