Fast detection of degradation in contemporary art objects by multispectral imaging.

Many materials used in contemporary art, especially those based on synthetic polymers, may present short degradation times. This requires a continuous monitoring of the state of conservation of art objects in order to study different preservation strategies or, as soon as needed, to schedule restoration actions. Between the various analytical techniques, those based on optical spectroscopy have the advantage of a minimal invasiveness. Moreover, image spectroscopy is a relatively fast technique, an essential feature for routine analysis. Here we present preliminary results of reflectance and fluorescence imaging in the visible region from layers of common contemporary binders (acrylic and polyvinyl acetate resins), which underwent accelerated aging. The materials were also thoroughly characterized by standard laboratory techniques (Raman, FTIR, UV-Vis excitation and absorption spectroscopy) to study the degradation process. The spatial and spectral resolution required to assess the state of degradation by image spectroscopy will be discussed.