Analisi non invasive e digitalizzazione per la fruizione dello “Sposalizio della Vergine” del Guercino

The famous painting “Sposalizio della Vergine” by Giovanni Francesco Barbieri, also known as Guercino, was realized in 1649 for the Mariotti family altar in the San Paterniano church in Fano (Italy). During the XIX century it was stolen but then fortunately recovered, even if in extremely poor conditions. The painting was restored and acquired by Fondazione Cassa di Risparmio di Fano in 1969. Through the application of non-invasive techniques, it was evaluated its conservation state and a mapping of the pictorial reintegrations was achieved. Multispectral imaging analyses (Infrared Refl ectography, Infrared False Color photography, Ultraviolet Fluorescence, Raking Light) provided also information on the painting technique that is coherent with the Guercino modus operandi already reported in literature. For example, the underdrawing is absent as in other Guercino’s paintings. Moreover, raking light images and macro-photography revealed the characteristics of the original canvas support, no more visible due to the lining intervention carried out in a previous restoration. Lastly, as far as concern the analysis of the materials, XRF (X-ray Fluorescence spectroscopy), FT-IR (Fourier Transform Infrared Spectroscopy) and FORS (UVVIS- NIR Fiber Optics Refl ectance Spectroscopy) were combined to characterize the artist’s palette. As blue pigment, the precious lapis lazuli was extensively used by the artist, and this suggested a very high price for the execution of the painting. Alongside the non-invasive diagnostic analyses, a 3D digitalization of the altarpiece was exploited to document its whole structure but also fi nest details, providing an effective medium to enable virtual ways to enjoy the painting. Indeed, thanks to a digital facsimile, it is possible to develop solutions able to generate different relationships between the work of art and its observer, letting him know its contents, its techniques, its expressive and aesthetic meaning. The mobile application presented in this paper is specifi cally designed as an intermediary between the “Sposalizio della Vergine” by Guercino and the user, a tool of XIII International Conference - Naples 14 - 15 - 16 December 2022 26

DIY bioplastics from peanut hulls waste in a starch-milk based matrix

A self-produced (DIY) material has been developed from peanut hulls waste in a starch-milk based matrix, which has been referred to as Peanmat. This is obtained after some attempts, which are also shown, of including this waste in a DIY bioplastic. It shows some potential in terms of sustaining its own load and to make small objects, such as buttons, for design purposes. Its limits were clarified by thermal characterisation in terms of not being able to exceed temperatures of around 80°C and suffering non uniform deformation, especially in the case its thickness does not go beyond a few millimetres. Colouration tests proved effective. Of course, the material is in search of full mechanical characterisation though it proved suitable to be punched and did not suffer fragmentation or excessive porosity

Chemical, morphological and mechanical study of the ageing of textile flax fibers from 17th/18th-century paintings on canvas

International audienceA variety of techniques were used to investigate flax yarns sampled from four selected Italian paintings on canvas dated between the 17th and 18th centuries and compare them with a modern flax yarn. The goal was to establish their state of preservation and highlight the critical issues thanks to a combined approach that used SEM, atomic force microscopy, nanoindentation, nuclear magnetic resonance, second harmonic generation imaging microscopy and FTIR spectroscopy. The condition of the flax fibres was assessed, and the results showed that two of the four canvases were in a generally good state of preservation, while the other two exhibited signs of biological attack and brittleness due to a previous relining intervention

CHARACTERIZATION OF HISTORICAL MASONRY MORTAR FROM SITES DAMAGED DURING THE CENTRAL ITALY 2016-2017 SEISMIC SEQUENCE: THE CASE STUDY OF ARQUATA DEL TRONTO

Mortar quality is a fundamental parameter to take into account when studying the structural behavior of masonry, especially under seismic actions. Separation between the leaves of rubble masonry can occur, inducing the partial or total collapse of the construction. A good quality mortar is essential to delay/prevent the separation of leaves, but often, especially in ancient building with a cultural value, mortars have low binder capabilities. The paper presents an experimental investigation on mortar specimens taken from buildings of a little municipality in Marche region, Arquata del Tronto, heavily damaged by recent earthquakes in Central Italy (2016-2017). Both diagnostic techniques as X-Ray diffraction, Fourier-Transform infrared spectroscopy and calcimetry, and mechanical test as compression tests were carried out in order to correlate the obtained values with the performance of the original masonry