Versão em português
N.º 29
2018
pp. 41-50

 

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

Ana Bidarra1,2,*, Günter Buzanich3, João Coroado4 , Fernando Rocha5 

1 Geobiotec/Departamento de Geociências, Campus Universitário de Santiago, 3810-193 Aveiro, Portugal

2 Cinábrio – Conservação e Restauro, Rua Almirante Cândido dos Reis , n.º 28, 3.º T, 3800-096 Aveiro, Portugal

3 BAM Federal Institute for Materials Research and Testing, 12200 Berlin, Germany

4 Departamento de Conservação e Restauro, Instituto Politécnico de Tomar, Quinta do Contador, Estrada da Serra, 2300-313 Tomar, Portugal

5 Geobiotec/Departamento de Geociências, Campus Universitário de Santiago, 3810-193 Aveiro, Portugal

* bidarra.ana@gmail.com

Abstract

The gold leaf from one of the most important art works of the Portuguese Baroque period, the main altarpiece of the Church of Jesus in Aveiro, currently part of the city Museum and former Convent of Jesus, was studied. Qualitative analysis of the samples cross-section was performed by optical microscopy. Three different layers – ground layer, bole and gold – were identified, a result consistent with a traditional gilding. The use of scanning electron microscopy with energy dispersive spectroscopy (SEM-EDS) showed the use of a ternary Au-Ag-Cu alloy, with approximately 22 carats. Through inductively coupled plasma mass spectrometry (ICP-MS) it was possible to identify trace elements such as Cr, Pt, Pd and Sn in the gold, and Pb and Hg in the bole layer. The use of synchrotron radiation micro X-ray fluorescence (SR-µXRF) confirmed the presence of Sn and allowed to establish a profile of the main elements in the samples.

Keywords

Gold leaf
Baroque altarpieces
Optical microscopy (OM)
Scanning electron microscopy (SEM-EDS)
Inductively coupled plasma mass spectrometry (ICP-MS)
Synchrotron radiation micro X-ray fluorescence (SR-µXRF)

Language

Portuguese

Original title

Estudo tecnológico e composicional da folha de ouro de retábulos barrocos – bases para uma metodologia de investigação

DOI

10.14568/cp2016035

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Citation

Conservar Património | APA | Chicago | NP405 | ABNT

Conservar Património:
Bidarra, A.; Buzanich, G.; Coroado, J.; Rocha, F., 'Estudo tecnológico e composicional da folha de ouro de retábulos barrocos – bases para uma metodologia de investigação', Conservar Património 29 (2018) 41-50, https://doi.org/10.14568/cp2016035.

APA:
Bidarra, A., Buzanich, G., Coroado, J., & Rocha, F. (2018). Estudo tecnológico e composicional da folha de ouro de retábulos barrocos – bases para uma metodologia de investigação. Conservar Património, 29 41-50. DOI:10.14568/cp2016035.

Chicago:
Bidarra, Ana, Günter Buzanich, João Coroado, and Fernando Rocha. 2018. "Estudo tecnológico e composicional da folha de ouro de retábulos barrocos – bases para uma metodologia de investigação." Conservar Património 29:41-50. doi:10.14568/cp2016035.

NP405:
BIDARRA, Ana [et al.] – Estudo tecnológico e composicional da folha de ouro de retábulos barrocos – bases para uma metodologia de investigação. Conservar Património. [Em linha]. 29 (2018) 41-50 [Consult. ]. Disponível em WWW: <URL:https://doi.org/10.14568/cp2016035>. ISSN 21829942.

ABNT:
BIDARRA, Ana et al. Estudo tecnológico e composicional da folha de ouro de retábulos barrocos – bases para uma metodologia de investigação. Conservar Património, Lisboa, v. 29, p. 41-50, 2018. Disponível em: <https://doi.org/10.14568/cp2016035>. Acesso em: .

History

Received: 2016-12-11
Revised: 2017-12-23
Accepted: 2018-1-7
Online: 2018-1-19
Publication: 2018-9-29

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Stable url: https://doi.org/10.14568/cp2016035


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