Abstract
Two case studies of calcium fatty acid salts in oil paint are presented. The first is a nineteenth-century oil on canvas painting, and the second is a decoratively painted ceiling. In both cases, the calcium soaps have formed in the lower layers of the paint systems and are associated with significant delamination and paint loss. The results of analysis of samples from the two works using FTIR, SEM-EDX, Raman, PLM, and Py-GC-MS are presented. The components of the paint and ground involved in the soap formation, the conditions that may have led to their formation, and the treatment strategies that were chosen are described.
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Notes
- 1.
In one area, on a flat, vertical surface of a hexagonal coffer, the plaster was found to be composed of gypsum.
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Helwig, K. et al. (2019). The Formation of Calcium Fatty Acid Salts in Oil Paint: Two Case Studies. In: Casadio, F., et al. Metal Soaps in Art. Cultural Heritage Science. Springer, Cham. https://doi.org/10.1007/978-3-319-90617-1_17
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DOI: https://doi.org/10.1007/978-3-319-90617-1_17
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