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Fire-gilding is a historic technique for the application of golden layers on a number of different base materials utilizing a gold amalgam. This technique leaves a significant amount of Hg in the golden layer, giving archeometrists a reliable indicator to identify firegildings.
Recent findings on presumably fire-gilded objects have shown in several cases significantly lower Hg content than previously studied objects. This prompted a synchrotron-based X-ray fluorescence investigation into the Hg distribution along the material–gilding interface, as well as a series of measurements regarding the Hg content development in fire-gilded samples during artificial aging. This work presents findings on laboratory-prepared fire-gildings, indicating an Hg enrichment at the interface of firegilded silver samples. Notably, such an enrichment is missing in fire-gilded copper samples. Further, it is confirmed that fire-gilded layers typically do not undercut an Hg bulk content of 5%. In this light, it seems improbable that ancient samples that contain <5% Hg are fire-gilded. The results presented in this study might lead to a non-destructive method to identify the Hg enrichment at the interface. This might be obtained by a combination of different non-destructive measurements and might also work unambiguously in samples in which the gold top layer is altered.
Reiche, I. ; Berger, Achim ; Görner, Wolf ; Merchel, Silke ; Radtke, Martin ; Riederer, J. ; Riesemeier, Heinrich
Constantinescu, B. ; Bugoi, R. ; Cojocaru, V. ; Radtke, Martin ; Calligaro, T. ; Salomon, J. ; Pichon, L. ; Röhrs, S. ; Ceccato, D. ; Oberländer-Târnoveanu, E. ; Ionescu, C. ; Pop, D.
Reiche, I. ; Berger, Achim ; Duval, A. ; Görner, Wolf ; Guicharnaud, H. ; Merchel, Silke ; Radtke, Martin ; Riederer, J. ; Riesemeier, Heinrich ; Roth, M.
Reiche, I. ; Berger, Achim ; Duval, A. ; Görner, Wolf ; Guicharnaud, H. ; Merchel, Silke ; Radtke, Martin ; Riederer, J. ; Riesemeier, Heinrich ; Roth, M.
Merchel, Silke ; Berger, Achim ; Görner, Wolf ; Radtke, Martin ; Riesemeier, Heinrich ; Reiche, I. ; Riederer, J. ; Duval, A. ; Guicharnaud, H.
Reiche, I. ; Berger, Achim ; Duval, A. ; Görner, Wolf ; Guicharnaud, H. ; Merchel, Silke ; Radtke, Martin ; Riederer, J. ; Riesemeier, Heinrich ; Roth, M.
Reiche, I. ; Berger, Achim ; Duval, A. ; Görner, Wolf ; Guicharnaud, H. ; Merchel, Silke ; Radtke, Martin ; Riederer, J. ; Riesemeier, Heinrich
De Samber, B. ; Scharf, Oliver ; Buzanich, Günter ; Garrevoet, J. ; Tack, P. ; Radtke, Martin ; Riesemeier, Heinrich ; Reinholz, Uwe ; Evens, R. ; De Schamphelaere, K. ; Falkenberg, G. ; Janssen, C. ; Vincze, L.
Besides conventional scanning X-ray fluorescence imaging at synchrotron sources, full-field X-ray fluorescence (FF-XRF) imaging techniques that do not implicitly require spatial scanning of the sample have become available. FF-XRF has become achievable thanks to the development of a new type of energy dispersive CCD-based 2D detector, also referred to as a 'color X-ray camera (CXC)' or 'SLcam'. We report on different imaging schemes for biological samples using FF-XRF imaging: (a) 2D 'zoom' imaging with pinhole optics using the 'camera obscura' principle; (b) 2D 'fixed magnification' imaging using magnifying polycapillary optics; and (c) 3D-FF-XRF imaging using an X-ray sheet beam or computed tomography (CT). The different FF-XRF imaging modes are illustrated using the crustacean Daphnia magna, a model organism for investigating the effects of metals on organism/ecosystem health, and foraminifera, a class of amoeboid protist. Detailed analytical characterization of the set-up is performed through analyzing various reference materials in order to determine limits of detection (LODs) and sensitivities. Experiments were performed using the BAMline at the BESSY synchrotron (Berlin, Germany) and using the P06 Hard X-ray Microprobe at the PETRAIII synchrotron (Hamburg, Germany).