Publications by authors named "Chiara Grazia"

Article Synopsis
  • The degradation of cadmium sulfide (CdS)-based oil paints poses a significant threat to Edvard Munch's 1910 painting, with the transformation into cadmium sulfate and sulfites not being well understood.
  • Recent studies utilizing noninvasive spectroscopy and advanced x-ray microspectroscopy have uncovered that moisture and mobile chlorine compounds largely contribute to the oxidation of CdS, while light exposure is less impactful.
  • Additionally, under humid conditions, reactions within the paint can lead to the dissolution and migration of soluble paint phases, resulting in the formation of cadmium sulfates.
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Article Synopsis
  • This study explores how Visible Hyperspectral Imaging was used to analyze glass chromophores in two windows at Casa-Museu Dr. Anastácio Gonçalves in Lisbon, Portugal.
  • Measurements were taken using natural sunlight, and the advantages and disadvantages of this method are discussed.
  • The analyses revealed that the Dining Room glass window contained multiple colorants like iron and manganese, while the Atelier panel used painted techniques with chromophores similar to those in the Dining Room.
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The restoration of a panel painting depicting a Madonna and Child listed as an unknown Tuscan artist of the nineteenth century, permitted the hidden original version, a XIII century Medieval icon to be uncovered. It is discovery provided the opportunity for an extensive in situ campaign of non-invasive analytical investigations by portable imaging and spectroscopic techniques (infrared, X-ray fluorescence and diffraction, UV-Vis absorption and emission), followed by aimed micro-destructive investigations (Raman and SEM-EDS). This approach permitted characterization of the original ground and paint layers by complementary techniques.

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The present study was undertaken to investigate the photophysical properties of the organic-metal compounds which are the main components of madder lake, one of the most commonly used and widespread organic pigments in painted artworks, from both geographic and historic points of view. Alizarin- and purpurin-Al(III) complexes were studied in solution and as powders. In solution, the chelate stoichiometry, their absorption and emission properties and the efficiency of their excited electronic state deactivation pathways have been determined.

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