PRELIMINARY ANALYSIS AND DIAGNOSTIC F. Rizzi R.Giorio B. D’Incau S. Franceschi A. Lazzari A. Sella S. Pozzacchio C. Rigoni F. Romano C. Scardellato
CMR Center Materials R E S E A R C H
beniculturali@cmr-lab.it www.cmr-lab.it
Fig 1. Visible light painting with mapping of the sampling points 8. Thermography 9. Digitally superimposed thermography on the image of the visible light painting
THE MADONNA OF ANCONETTA, DIAGNOSTICS, PROJECT AND RESTORATION DIAGNOSTIC IMAGING: RADIOGRAPHIC IMAGING; IR REFLECTOGRAPHY, UV FLUORESCENCE INVESTIGATIONS, IR THERMOGRAPHIC IMAGES Diagnostic imaging techniques, such as IR reflectographic observation, X-ray radiographic technique and IR thermographic mapping of the artwork, have allowed to identify areas with different electromagnetic response and different radiopacity in the icon. This distinction was useful for the collection of the micro samples that were distributed in the various identified sectors in order to characterize the different stratigraphic packages (Fig. 1). The combination of imaging techniques with chemical - stratigraphic characterization has made it possible to perform a digital mapping of the different types of stucco reintegration interventions, differentiating the various interventions from the original ground preparatory layer. The following types of stucco painting preparation were therefore identified:
Type 1: original preparation with plaster and animal glue, spread in two layers, the first with larger grain size plaster.
Type 2: refers to a subsequent restoration intervention, consisting of a primer based on calcium carbonate, drying oil added with barium white. The characteristic radiopacity of the latter made it possible to recognize its limits on the plate, identifying both the filling of the original ground layer and paint layer gaps (lacuna) and the overflowing additions.
Type 3: referable to a second intervention after the original, based on calcite, plaster and drying oil. Also, in this case it was possible, thanks to the radiographic investigation, to map graphically on digital support to report the area. 01
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