Cronica cercetărilor arheologice 1990-1993

Mihai, Dana

doi:10.46535/ca.10.24

Cited by 1 publication

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“…A group of ancient bronze coins, discovered in 2000, 13 on the territory of Romania, from the Nufarul archaeological site (Tulcea County), have been studied. Six a patina for coin coming from archaeological nondisturbed site and with low humidity; 6 b patina for coin coming from archaeological site with fluctuant chemistry produced by abundant subterranean water 3 1 Microstratigraphical structure of archaeological patina:…”

Section: Experimental Techniquesmentioning

confidence: 99%

Pedological stratification effect of corrosion and contamination products on Byzantine bronze artefacts

Sandu¹,

Ursulescu²,

Sandu³

et al. 2008

Corrosion Engineering, Science and Technology

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The present paper deals with the identification of six ancient Byzantine bronze coins found in the same archaeological site of Nufarul (Tulcea County, Romania), by corrosion product and alloy analysis. The microstratigraphies (i.e. layers), together with microchemical tests including reflection colorimetry, IR spectroscopy, X-ray diffraction and scanning electron microscopy assisted by X-ray spectrometry have rendered evident the stratified morphology of three types of patina. They are the primary type resulting from redox processes, the secondary type determined by acid-base and related hydrolytic processes and the ternary type (or the contamination patina) from segregation, diffusion and osmosis processes. The stratigraphical distribution of the chemical components in the structure of the patina is caused by the pedological (soil) processes at the archaeological sites and can be the main factor used in the authentication of ancient bronze artefacts.

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Section: Experimental Techniquesmentioning

confidence: 99%