GILDINGS AND FALSE GILDINGS OF THE BAROQUE AGE: CHARACTERIZATION AND CONSERVATION PROBLEMS

Davide Gulotta · Sara Goidanich · Michele Bertoldi · Susanna Bortolotto · Lucia Toniolo

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Cultural Heritage Materials Analysis Historical Art and Architecture Studies Building materials and conservation

Abstract

This work investigates the decayed decoration of the ‘Vergine del Carmelo’ chapel, with a particular interest in the residual gildings. Samples of the finishing layers were examined by VIS‐UV optical microscopy and scanning electron microscopy coupled with EDX spectrometry, in order to evaluate the unusual degradation phenomena. Mineralogical composition of the stucco substrate was characterized by X‐ray diffraction (XRD) and FTIR spectroscopy. The results showed the unexpected presence of a thick layer of brass flakes, applied without any binder, used as a substitute for the damaged original gold leaf, and highlighting a very uncommon selective corrosion process of the brass.

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References

1992Metallography and Microstructure of Ancient and Historic Metals 2003Clay and iron oxide pigments in the history of painting 1943Painting Materials : a Short Encyclopedia 1983The Artist's Handbook of Materials and Techniques 1991La Chimica nel Restauro: I Materiali dell'Arte Pittorica 1998Characterization of ancient magnesian mortars coming from northern Italy 2004Decay markers for the preventative conservation and maintenance of paintings 2004A post-Byzantine icon of St Nicholas painted on a leather support. Microanalysis and characterisation of technique

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