Study of copper nitrate‐based patinas

V. Hayez · Tiriana Segato · Annick Hubin · Herman Albert Terryn

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Cultural Heritage Materials Analysis Corrosion Behavior and Inhibition Building materials and conservation

Abstract

Abstract Artificial patination is mostly based on empirical recipes for which the result is difficult to forecast. Little is known about the final corrosion compound formed on the patinated object. Therefore, different patinas based on copper nitrate—an ingredient recurrent in numerous references—were realized according to traditional recipes. Their characteristics of morphology and molecular composition were studied using various methods such as scanning electron microscopy (SEM)‐energy dispersive X‐ray analysis (EDX), X‐ray diffraction analysis (XRD) and Raman spectroscopy (RS). A better understanding of artificial patinas will not only allow developing appropriate methods of conservation and restoration, but also differentiating between natural and artificial patinas. An example of a patina present on an ancient artifact is discussed and compared with the studied artificial patinas. Copyright © 2006 John Wiley & Sons, Ltd.

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References

2003Catalogue of 45 reference Raman spectra of minerals concerning research in art history or archaeology, especially on corroded metals and coloured glass 2003Raman spectroscopy of selected copper minerals of significance in corrosion 2002Surface characterization of artificial corrosion layers on copper alloy reference materials 2004Micro‐Raman spectroscopy for the study of corrosion products on copper alloys: setting up of a reference database and studying works of art 2005Micro Raman spectroscopy used for the study of corrosion products on copper alloys: study of the chemical composition of artificial patinas used for restoration purposes

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