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29 results on '"Schmidt-Ott, Katharina"'

3. Monitoring and Understanding VOC Induced Glass Corrosion Using Multi-modal Imaging Techniques

Author

Sharma, Deepshikha, Rothenhaeusler, Ulrike, Schmidt-Ott, Katharina, Nurit, Marvin, Cartagena, Yuly Castro, Le-Goic, Gaetan, Joseph, Edith, George, Sony, Lombardo, Tiziana, Chaari, Fakher, Series Editor, Gherardini, Francesco, Series Editor, Ivanov, Vitalii, Series Editor, Cavas-Martínez, Francisco, Editorial Board Member, di Mare, Francesca, Editorial Board Member, Haddar, Mohamed, Editorial Board Member, Kwon, Young W., Editorial Board Member, Trojanowska, Justyna, Editorial Board Member, Furferi, Rocco, editor, Governi, Lapo, editor, Volpe, Yary, editor, and Seymour, Kate, editor

Published
2023
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15. Additional file 2 of Acquisition strategies for in-situ hyperspectral imaging of stained-glass windows: case studies from the Swiss National Museum

Author

Babini, Agnese, Lombardo, Tiziana, Schmidt-Ott, Katharina, George, Sony, and Hardeberg, Jon Yngve

Abstract

Additional file 2: Figure s4. a) close-up picture of case-study AG-1177, showing the point selected for the XRF analyisis. b) XRF spectra of the two glass panes used as reference for radiometric correction. c) zoom of the spectra showing the differences in concentration of iron and manganese in the two glass panes. Figure s5. a) close-up picture of case-study LM-8368, showing the point selected for the XRF analyisis. b) XRF spectra of the two glass panes used as reference for radiometric correction. c) zoom of the spectra showing the differences in concentration of iron and manganese in the two glass panes.

Published
2023
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16. Additional file 1 of Acquisition strategies for in-situ hyperspectral imaging of stained-glass windows: case studies from the Swiss National Museum

Author

Babini, Agnese, Lombardo, Tiziana, Schmidt-Ott, Katharina, George, Sony, and Hardeberg, Jon Yngve

Abstract

Additional file 1: Table s1. Acquisitions parameters of case study IN-11.64. Table s2. Acquisitions parameters of case study AG-1177. Table s3. Acquisitions parameters of case study LM-8368. Table s4. Acquisitions parameters for case study LM-749. Table s5. Acquisition parameters for case study LM-749. Figure s1. sun position during HSI acquisitions for case study AG-1177, calculated through the website SunCalc.org. Figure s2. Sun position during HSI acquisitions for case study IN-64.11, calculated through the website SunCalc.org. Figure s3. sun position during HSI acquisitions for case study LM-8368, calculated through the website SunCalc.org.

Published
2023
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17. Monitoring and Understanding VOC Induced Glass Corrosion Using Multi-modal Imaging Techniques

Author

Sharma, Deepshikha, Rothenhaeusler, Ulrike, Schmidt-Ott, Katharina, Nurit, Marvin, Castro Cartagena, Yuly, Joseph, Edith, George, Sony, and Lombardo, Tiziana

Subjects
Hyperspectral imaging, Digital photography, Glass corrosion, Artificial aging, Reflectance transformation imaging, Optical microscopy
Abstract

Historical transparent glass is a fragile and challenging material. Deterioration of historical glass objects kept in presence of volatile organic compounds (VOCs) mainly formaldehyde, formic acid and acetic acid, is a known phenomenon. Similar issues were encountered with glass objects in the collection centre of the Swiss National Museum, belonging to 17th–20thcentury CE. Until 1999, these objects were stored in chipwood mobile shelving units (a source of VOCs) in conditions with fluctuating relative humidity (RH) levels and temperature. To study this phenomenon, model glasses were produced and subjected to accelerated aging with variable relative humidity and in the presence of acetic acid and formic acid. The aged samples were documented using digital techniques such as digital photography, reflectance transformation imaging, optical microscopy, and hyperspectral Imaging (HSI) to assess changes in their appearance and to detect early signs of corrosion. The results from the application of multi-modal imaging techniques to visualize the surface of transparent colourless glass show promise for the documentation of VOC induced corrosion phenomena on glass surfaces.

Published
2022

21. Observation and analysis of Zwischgold on late medieval sculptures

Author

Bridgland, Janet, Bridgland, J ( Janet ), Wu, Qing, Lombardo, Tiziana, Hubert, Vera, Hildbrand, Erwin, Wyer, Peter, Schmidt-Ott, Katharina, Fink, Rainer, Watts, Benjamin, Nolting, Frithjof, Bridgland, Janet, Bridgland, J ( Janet ), Wu, Qing, Lombardo, Tiziana, Hubert, Vera, Hildbrand, Erwin, Wyer, Peter, Schmidt-Ott, Katharina, Fink, Rainer, Watts, Benjamin, and Nolting, Frithjof

Abstract

Zwischgold is a gold-silver bi-layer foil that was popular in medieval European sculptures yet is poorly documented in both historical and modern literature. It is notoriously difficult to identify unambiguously and to study in detail due to its ultra-thinness and tendency to corrode. This article focuses on understanding the corrosion states and technological features of medieval Zwischgold. High-resolution scanning electron microscopy/energy-dispersive X-ray analysis was conducted on 72 Zwischgold samples taken from 47 objects, prepared with ultra-microtomy to investigate the foil structures, layer thickness, elemental composition and corrosion products. Supporting data was obtained through FTIR and Raman spectroscopy regarding the surrounding materials, especially the binding media and pigments. This article aims to fill the knowledge gap in the history of medieval gilding technology and to provide a scientific basis for future conservation and restoration of Zwischgold artefacts in strongly corroded states.

Published
2021

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