Interactions between inorganic pigments and rabbit skin glue in reference paint reconstructions
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The thermal degradation of rabbit skin glue, a collagen-based proteinaceous material used as a paint binder in paintings, was investigated in this paper. Paint reconstructions of the glue on its own or mixed with azurite (Cu3(CO3)2(OH)2), calcium carbonate (CaCO3), hematite (Fe2O3·nH2O) and red lead (Pb3O4) were analysed using a thermoanalytical approach. This method enabled us to investigate the interactions between the glue and pigments before and after artificial indoor light ageing. The study was carried out using differential scanning calorimetry, thermogravimetry and thermogravimetry/FTIR analysis already successfully employed to characterize the paint binders. The results highlighted that all the inorganic pigments interact with rabbit skin glue, thus decreasing the thermal stability of the binder. Light ageing further decreased the thermal stability of pigmented paint replicas, suggesting a moderate increase in the rate of the degradation.
KeywordsRabbit skin glue Azurite Calcium carbonate Hematite and red lead Thermogravimetric analysis Differential scanning calorimetry
This work was supported by PRIN 2008 (Project No. 2008XXAMZT) and PRIN 2010/2011 (Project No. 2010329WPF) funding from the Italian Ministry of University and Research.
- 6.Carr DW. Andrea Mantegna, the Adoration of the Magi. Getty Museum Studies on Art Los Angeles, Christopher Hudson, Publisher, Mollie Holtman, editor; 1997.Google Scholar
- 10.Rosi F, Daveri A, Miliani C, Verri G, Benedetti P, Pique F, Brunetti BG, Sgamellotti A. Non-invasive identification of organic materials in wall paintings by fiber optic reflectance infrared spectroscopy: a statistical multivariate approach. Anal Bioanal Chem. 2009;395:2097–106.CrossRefGoogle Scholar
- 27.Pourdier J. Status of knowledge of the constitution of gelatin. Sci Ind Photogr. 1948;19:81–91.Google Scholar
- 30.Bonaduce I, Carlyle L, Colombini MP, Duce C, Ferrari C, Ribechini E, Selleri P, Tiné MR. A multi-analytical approach to studying binding media in oil paintings. Characterisation of differently pre-treated linseed oil by DE–MS, TG, and GC/MS. J Therm Anal Calorim. 2012;107:1055–66.CrossRefGoogle Scholar
- 34.Odlyha M, Cohen NS, Foster GM, West RH. Dosimetry of paintings: determination of the degree of chemical change in museum exposed test paintings (azurite tempera) by thermal and spectroscopic analysis. J Therm Anal Calorim. 2000;365:53–63.Google Scholar