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Tracking asphalt markers in bitumen oil paint reconstructions by Py-TMAH-GC/MS and Py-GCxGC/MS
Publication . Marques, Raquel; Sablier, Michel; Boon, Jaap J.; Rosé, Gauthier; Carlyle, Leslie; Cardoso, Isabel Pombo; De Viguerie, Laurence; LAQV@REQUIMTE; DCR - Departamento de Conservação e Restauro; Elsevier
Bitumen brown oil paint reconstructions based on 19th century production records from the British colourman Winsor & Newton were analysed using thermally assisted methylation with tetramethylammonium hydroxide (Py-TMAH-GC/MS), and pyrolysis comprehensive two-dimensional gas chromatography (Py-GCxGC/MS). Reconstructions were compared with the starting material, Trinidad Lake asphalt (TLA), to determine how detectable this asphalt is after heat processing in lead treated linseed oil. The use of brown paint containing asphalt/bitumen (the names are used interchangeably) was blamed for severe film-forming defects in 18th and 19th century oil paintings, yet this material has rarely been identified in earlier studies of historical paintings. This research offers a possible explanation for the paucity of evidence as it reveals that asphalt markers identified in the TLA disappear in the first stage of reconstructing bitumen brown oil paint.
Assessing the decorative techniques of two Art Nouveau glass windows by optical coherence tomography (OCT)
Publication . Palomar, Teresa; Iwanicka, Magdalena; Pombo Cardoso, Isabel; Vilarigues, Márcia; Targowski, Piotr; VICARTE - Vidro e Cerâmica para as Artes; LAQV@REQUIMTE; DCR - Departamento de Conservação e Restauro; SpringerOpen
This work presents an assessment of the different decoration techniques applied in the two glass windows from the Casa-Museu Dr. Anastácio Gonçalves (Lisbon, Portugal) by Optical coherence tomography (OCT). The Dining Room glass window was found to be decorated with grisailles and acid etching, and the Atelier window with grisaille, enamel, and cold painting. The alteration state of the surface decorations was also assessed. The thicker surface decorations (grisailles and enamels) presented cracks and detachments, in contrast to the thinner lines which are normally well preserved. OCT is a suitable technique for characterizing glass decoration in situ without dismounting the stained-glass window; and able to reveal the condition and methods of manufacture that cannot be detected simply by visual inspection.
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Fundação para a Ciência e a Tecnologia
Programa de financiamento
3599-PPCDT
Número da atribuição
PTDC/ART-OUT/5992/2020