Versão em português
N.º 34
2020
pp. 134-142

 

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Intervention
Removal of iron oxides from a sixteenth century ornamental fountain belonging to Quinta da Cardiga (Torres Novas, Portugal)

Nuno Pereira1,*, Marco Rocha1, Manuel Rosa1,2 , Fernando Costa1,2 

1 Instituto Politécnico de Tomar, Estrada da Serra, 2300-313 Tomar, Portugal

2 Techn&Art - Centro de Tecnologia, Restauro e Valorização das Artes, Instituto Politécnico de Tomar, Estrada da Serra, 2300-313 Tomar, Portugal

* nunomonteiropereira@gmail.com

Abstract

The ornamental fountain in marble and breccia is a 16th century Italian work integrated in the small courtyard of the Cardiga Palace (Torres Novas, Portugal) currently in restoration process. The iron spikes used to connect the constituent elements were corroded and contaminating the base stone elements surfaces with intense stains of metallic oxides. There was a suspicion that, apart the surface, these oxides could have migrated in depth through the porous structure of the material. The performance of the iron oxides removal tests was evaluated using optical measurements in the CIELAB color space after each chelant application. Sodium dithionite was found to exert a substantially higher cleaning action than ammonium citrate. After finishing the treatment with the most efficient chelant, the chelating action was verified below the surface of the marble. It was found that at the depth of 1 mm the material remained contaminated with iron oxides, with an evident color contrast with a treated surface.

Keywords

Conservation
Restoration
Marble
Chelants
Spectrophotometry

Language

Portuguese

Original title

Remoção de óxidos de ferro de uma fonte ornamental quinhentista pertencente à Quinta da Cardiga (Torres Novas, Portugal)

DOI

10.14568/cp2018063

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Citation

Conservar Património | APA | Chicago | NP405 | ABNT

Conservar Património:
Pereira, N.; Rocha, M.; Rosa, M.; Costa, F., 'Remoção de óxidos de ferro de uma fonte ornamental quinhentista pertencente à Quinta da Cardiga (Torres Novas, Portugal)', Conservar Património 34 (2020) 134-142, https://doi.org/10.14568/cp2018063.

APA:
Pereira, N., Rocha, M., Rosa, M., & Costa, F. (2020). Remoção de óxidos de ferro de uma fonte ornamental quinhentista pertencente à Quinta da Cardiga (Torres Novas, Portugal). Conservar Património, 34 134-142. DOI:10.14568/cp2018063.

Chicago:
Pereira, Nuno, Marco Rocha, Manuel Rosa, and Fernando Costa. 2020. "Remoção de óxidos de ferro de uma fonte ornamental quinhentista pertencente à Quinta da Cardiga (Torres Novas, Portugal)." Conservar Património 34:134-142. doi:10.14568/cp2018063.

NP405:
PEREIRA, Nuno [et al.] – Remoção de óxidos de ferro de uma fonte ornamental quinhentista pertencente à Quinta da Cardiga (Torres Novas, Portugal). Conservar Património. [Em linha]. 34 (2020) 134-142 [Consult. ]. Disponível em WWW: <URL:https://doi.org/10.14568/cp2018063>. ISSN 21829942.

ABNT:
PEREIRA, Nuno et al. Remoção de óxidos de ferro de uma fonte ornamental quinhentista pertencente à Quinta da Cardiga (Torres Novas, Portugal). Conservar Património, Lisboa, v. 34, p. 134-142, 2020. Disponível em: <https://doi.org/10.14568/cp2018063>. Acesso em: .

History

Received: 2018-12-8
Revised: 2019-3-11
Accepted: 2019-4-5
Online: 2019-4-24

References

1 Sequeira, G. M., Inventário Artístico de Portugal. Distrito de Santarém, vol. 3, Academia Nacional de Belas Artes, Lisboa (1949).

2 'Decreto n.o 38.673 de 12 de março', Ministério da Educação Nacional - Direção Geral do Ensino Superior e das Belas Artes (1952).

3 Batista, L. M. P., Cardiga. De Comenda a Quinta da Ordem de Cristo (15291630), Município de Torres Novas, Torres Novas (2009).

4 Selwyn, L.; Tse, S., 'The chemistry of sodium dithionite and its use in conservation', Studies in Conservation 53(S2) (2008), 61-73, https://doi.org/10.1179/sic.2008.53.Supplement-2.61.

5 Spile, S.; Suzuki, T.; Bendix, J.; Simonsen, K. P., 'Effective cleaning of rust stained marble', Heritage Science 4(1) (2016), 12, https://doi.org/10.1186/s40494-016-0081-6.

6 Macchia, A.; Ruffolo, S.; Rivaroli, L.; La Russa, M., 'The treatment of iron-stained marble: toward a "green" solution', International Journal of Conservation Science 7(1) (2016), 323-332, http://www.ijcs.uaic.ro/public/IJCS-16-SI15_Macchia.pdf (acesso em 2018-3-11).

7 Bams, V.; Dewaele, S., 'Staining of white marble', Materials Characterization 58(11-12) (2007), 1052-1062, https://doi.org/10.1016/j.matchar.2007.05.004.

8 Gervais, C.; Grissom, C. A.; Little, N.; Wachowiak, M. J., 'Cleaning marble with ammonium citrate', Studies in Conservation 55(3) (2010), 164-176, https://doi.org/10.1179/sic.2010.55.3.164.

9 Mokrzycki, W.; Tatol, M., 'Colour difference E- A survey', Machine Graphics and Vision 20(4) (2011), 383-411, https://www.researchgate.net/publication/236023905 (acesso em 2018-6-14).

Stable url: https://doi.org/10.14568/cp2018063

ARP | Associação Profissional de Conservadores-Restauradores de Portugal