Contributos para o estudo da folha de ouro de retábulos Barrocos por microscopia óptica e electrónica

Bidarra, Ana; Coroado, João; Rocha, Fernando

doi:10.37558/gec.v1i1.21

Cited by 5 publications

(2 citation statements)

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“…A proximidade de várias linhas, nomeadamente de Au e Pt e de Ag e Pd, pode originar a sobreposição dos picos [38]. A semiquantificação dos elementos minoritários é ainda restringida por factores como o ruído de fundo -sempre presente -e a matriz, entre outros [39]. As amostras revelam de forma clara a distribuição de Au, Ag e Cu e os elementos maioritários do bolo (Al e Si) (Figura 4).…”

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Technological and compositional study of the gold leaf from Baroque altarpieces – basis for a research methodology

et al. 2018

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Technological and compositional study of the gold leaf from Baroque altarpieces-basis for a research methodology Resumo Foi estudada a folha de ouro do retábulo-mor da igreja de Jesus em Aveiro, um dos mais interessantes exemplares de talha barroca portuguesa, localizado no actual Museu da Cidade e antigo Convento de Jesus. Efectuaram-se análises qualitativas dos cortes estratigráficos por microscopia óptica e identificaram-se três camadas distintas-preparação branca, bolo e ouro-consistentes com a aplicação de um douramento tradicional. A utilização de microscopia electrónica de varrimento com espectrometria de raios X por dispersão de energia (SEM-EDS) mostrou o uso de uma liga ternária de Au, Ag e Cu com aproximadamente 22 quilates. Através de espectrometria de massa com plasma indutivo (ICP-MS) identificaram-se elementos-traço: Cr, Pt, Pd e Sn nas camadas ouro e Pb e Hg no bolo. O emprego de microfluorescência de raios X por radiação de sincrotrão (SR-µXRF) permitiu confirmar a presença de Sn e traçar o perfil dos principais elementos presentes nas amostras.

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Technological and compositional study of the gold leaf from Baroque altarpieces – basis for a research methodology

et al. 2018

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“…In addition, it allows examination of the microstructure with line scans or 2D mapping of element concentration (Guerra & Calligaro, 2004; Hein & Degrigny, 2008). This method has been widely used in determination of the major elements and purity of the gold alloys (Bidarra et al, 2009, 2013, 2011). Suitability of XRF for paper filler characterization was reported by Manso et al (2007, 2008 a , 2008 b ) in historical and modern paper elemental characterization.…”

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Micro-Analytical Study of a Rare Papier-Mâché Sculpture

Manso

Bidarra²,

Longelin

et al. 2014

Microsc Microanal

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The analysis of a Portuguese "papier-mâché" sculpture depicting Saint Anthony is presented in this case study. Several questions were addressed such as the characteristics of the support, pigments used, and artistic technique in order to establish a possible timeline for its production. Qualitative analyses of the cross-sections and of the paper support were performed by optical microscopy using reflected light. Two polychrome layers from different periods and a rag pulped support were identified on the sculpture. The use of micro X-ray fluorescence and Raman microscopy techniques enabled the differentiation of coloring materials used in both polychromies. Semi-quantitative analyses of the gilded samples were also performed by scanning electron microscopy in combination with energy-dispersive spectroscopy allowing the determination of a common Au-Ag-Cu alloy with differences in the purity of the gold. The identified coloring materials lead us to believe that the sculpture was produced in the 19th century, being overpainted in the first half of the 20th century.

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An innovative, interdisciplinary, and multi-technique study of gilding and painting techniques in the decoration of the main altarpiece of Miranda do Douro Cathedral (XVII-XVIII^thcenturies, Portugal)

Sandu

Murta

Veiga

et al. 2013

Microsc. Res. Tech.

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The research results presented in this paper are part of a larger study on the materials and techniques used in polychrome altarpieces of gilded woodcarving decoration ("talha dourada") in Portugal. The paper focuses on a narrative Portuguese Altarpiece from Miranda do Douro, considered one of the masterpieces of "talha dourada" among all the retables of the Iberian Peninsula in XVII(th) and XVIII(th) centuries. Although on the Portuguese territory, the altarpiece was made by artists from the Royal Spanish school of Valladolid, under a mannerist style. Thus the study opens a window on the artists' circulation between Spain and Portugal and influences of the Spanish schools in Baroque epoch on the Portuguese "talha". During its history this altarpiece underwent several transformations and extensive conservation treatments in 1989. On this occasion more than 50 samples were collected and analyzed using an interdisciplinary multi-technique methodology. 27 of these samples are chosen for this study in order to investigate the chromatic palette, the materials and techniques used in the polychromy of the retable. A novel protocol of investigation using different conventional and unconventional analytical techniques (OM + fluorescent staining tests on cross-sections, Raman microscopy, XRD, XRF, X-ray micro-CT, SEM-EDX, MALDI-TOF-MS and LC-MS/MS) was established within an innovative research project (http://sites.fct.unl.pt/gilt-teller/) and applied on these samples. This protocol is necessary to confirm the results obtained in the 1989 campaign and to have further insight into the gilding and polychrome decoration materials and techniques and the additional information reported in the historical documents. The material and technical history of this important altarpiece will be thus re-documented from a scientific perspective, meant to confirm and bring new information on the decorative technique used in the creation of this complex Portuguese monument.

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Contributos para o estudo da folha de ouro de retábulos Barrocos por microscopia óptica e electrónica

Cited by 5 publications

References 5 publications

Technological and compositional study of the gold leaf from Baroque altarpieces – basis for a research methodology

Technological and compositional study of the gold leaf from Baroque altarpieces – basis for a research methodology

Micro-Analytical Study of a Rare Papier-Mâché Sculpture

An innovative, interdisciplinary, and multi-technique study of gilding and painting techniques in the decoration of the main altarpiece of Miranda do Douro Cathedral (XVII-XVIII^thcenturies, Portugal)

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Contributos para o estudo da folha de ouro de retábulos Barrocos por microscopia óptica e electrónica

Cited by 5 publications

References 5 publications

Technological and compositional study of the gold leaf from Baroque altarpieces – basis for a research methodology

Technological and compositional study of the gold leaf from Baroque altarpieces – basis for a research methodology

Micro-Analytical Study of a Rare Papier-Mâché Sculpture

An innovative, interdisciplinary, and multi-technique study of gilding and painting techniques in the decoration of the main altarpiece of Miranda do Douro Cathedral (XVII-XVIIIthcenturies, Portugal)

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An innovative, interdisciplinary, and multi-technique study of gilding and painting techniques in the decoration of the main altarpiece of Miranda do Douro Cathedral (XVII-XVIII^thcenturies, Portugal)