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The application of a multi-analytical approach has been adopted for the study of the 16th and 17th century wall paintings decorating the church of St. Alessandro in Lasnigo (Como, Northern Italy). Particular attention has been devoted to the wall painting representing the Crucifixion scene, work of the Master Andrea De Passeri (1514), using portable instruments as XRF, VIS-NIR, Raman spectrometry and IR Reflectography. Besides the analysis of the pigments palette used, XRF on the black crusts of the halos detected Au, Sn and Pb; the hypothesis, integrated by VIS-NIR Spectroscopy was that Au foil had been applied on a yellow background (Sn and Pb yellow). Historical evidences, supported by scientific analysis, showed that was common the application of a tin foil as preparation for the gilded halos on 14th-16th century wall paintings. Microanalysis on cross sections confirmed the historical background: a 10 micron tin foil was applied on an oil-based missione with the addition of Pb-based pigments as support to the gold foil. This complementary examination was really crucial because of literature also reports the use of Sn-Pb yellow as preparation layer for the gilding. Furthermore microanalysis shows that traces of Sn-Pb yellow pigments have been added to the oil-based missione. The concluding remark is that non-invasive analysis should be sometimes integrated at least by historical researches; microanalysis should be carried out when doubts arise on the original technique used.
Historical, microanalytical evidences and limits of non-invasive technologies in studying gildings on 16th C wall paintings
Weitere Titelangaben:
Historischer, mikroanalytischer Nachweis und Grenzen von nichtinvasiven Technologien bei der Untersuchung von Vergoldungen an Wandgemälden des 16. Jahrhunderts