Abstract
Bulk elemental compositions of 74 modern cast bronze sculptures from the collection at the Art Institute of Chicago, the Philadelphia Museum of Art, and the Rodin Museum (Philadelphia, PA) were determined using inductively coupled plasma-optical emission spectroscopy (ICP-OES) and a handheld x-ray fluorescence (XRF) spectrometer. The elemental compositions of the cast sculptures as measured previously by ICP-OES and presently by XRF are compared: A good match is found between the two methods for the base metal (Cu) and the two majority alloying elements (Zn and Sn). For both ICP-OES and XRF data, when the Zn composition is plotted versus the Sn composition, three discernable clusters are found that are related to the artist, foundry, casting date, and casting method; they consist of (A) high-zinc brass, (B) low-zinc, low-tin brass, and (C) low-zinc, tin bronze. Thus, our study confirms that the relatively fast, nondestructive XRF spectrometry can be used effectively over slower and invasive, but more accurate, ICP-OES to help determine a sculpture’s artist, foundry, date of creation, date of casting, and casting method.
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Acknowledgement
This research benefited from the financial support of the Andrew W. Mellon Foundation. The authors thank Francesca Casadio and Suzanne Schnepp (Art Institute of Chicago) for significant contributions to this article and useful discussions, Aniko Bezur (Institute for the Preservation of Cultural Heritage at Yale University) for useful discussions, Andrew Lins and Melissa Meighan (Philadelphia Museum of Art and Rodin Museum) for providing access to sculptures for XRF and ICP-OES measurements, and Juris Sarins (SIPI Metals Corporation) and Phil Meehan (National Bronze and Metals, Inc.) for providing bronze and brass reference materials.
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Young, M.L., Dunand, D.C. Comparing Compositions of Modern Cast Bronze Sculptures: Optical Emission Spectroscopy Versus x-Ray Fluorescence Spectroscopy. JOM 67, 1646–1658 (2015). https://doi.org/10.1007/s11837-015-1445-1
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DOI: https://doi.org/10.1007/s11837-015-1445-1