An overview of analytical techniques and methods for the study and preservation of artistic and archaeological bronzes

Part of : Mediterranean archaeology & archaeometry : international journal ; Vol.12, No.2, 2012, pages 261-271

Issue:
Pages:
261-271
Section Title:
Articles
Author:
Abstract:
The present review intends to give an overview on the type of information that is possible to gather from the application of different non-invasive and micro-destructive analytical techniques. Typically, methods that require the withdrawal of a sample, such as metallography, SEM-EDS, AAS, FTIR and Py-GC-MS are employed. Through their use, it is possible to identify the material constitution, to evaluate the degradation behaviour and the state of conservation of excavated bronze artefacts. It is also underlined how a non-invasive approach might be used whenever no sampling is allowed, though some limitation should be considered. Furthermore, analytical techniques play an important role in the characterisation and evaluation of the effectiveness of protective coatings and corrosion inhibitors before and after restoration procedures. An interesting aspect is the implication of science for the recognition of forgeries, when analytical studies provide evidences able to prove or deny objects’ authenticity.
Subject:
Subject (LC):
Keywords:
archaeological bronzes, metallography, corrosion, authentication
Notes:
Corresponding author: Rocco Mazzeo (rocco.mazzeo@unibo.it)
References (1):
  1. Ammannati N., Martellucci E., Mai G. (1991) Caratterizzazione metallurgica del bronzo mediante microscopia elettronica a scansione e microanalisi a raggi X, oPD Restauro 3, pp.19-24.Bosi C., Garagnani G.L., Imbeni V., Martini C., Mazzeo R., Poli G. (2002) Unalloyed copper inclusions in ancient bronze artifacts, Journal of materials science 37, pp. 4285-4298.Brostoff, L. B. (2003) Coating strategies for the protection of outdoor bronze art and ornamentation. National Gallery of Art, Washington, DC., Universiteit van Amsterdam. PhD.Chiavari G., Colucci A., Mazzeo R., Ravanelli M. (1999) Organic Content Evaluation of Corrosion Patinas in Outdoor Bronze Monuments, Chromatographia 1/2, Vol.49, pp. 35-41.Craddock P.T. (1976) The composition of the copper alloy used by Greek, Etruscan and Roman civilization, Journal of Archaeological Science, pp.93-113, pp.103-123, pp. 1-16.Gettens R.J. (1969) The freer Chinese bronzes, Oriental Studies N°7, Technical Studies Smithsonian Institution and Freer Gallery of Art Ed., Washington D.C., USA.Giardino C., Gigante G.E., Guida G., Mazzeo R. (1996) EDXRF and metallography for in situ simultaneous analysis of archaeological metal artefacts. In Proceedings of 5th International Conference on non-destructive testing, micro analytical methods and environmental evaluation for study and conservation of work of art, Budapest, 24-28 September pp. 327-337.Guida G., Marabelli M., Mazzeo R., Morigi G. (1994) Chemical and physical examination of the bronze sculptures of the Fountain of Neptune in relation to the restoration, the identification of the construction technique and previous restoration works, Science and Technology for Cultural Heritage 3, pp. 75-88.Hughes R. and Rowe M. (1991) The colouring, bronzing and patination of metals.Watson-Guptill Pubblications/Whitney Library of Design.Joseph, E., P. Letardi, et al. (2007) Innovative Treatments for the Protection of Outdoor Bronze Monuments. In Metal 07, triennialmeeting of ICoM-CC Metal Working Group, Amsterdam, September 17-21. B.Ankersmit, C. Degrigny, I. Joosten and R. van Langh (eds). Amsterdam, Netherlands Institute of Conservation, pp. 71-77.Letardi, P. (2004) Laboratory and field test on patinas and protective coating systems for outdoor bronze monuments. In Metal 2004. (J. Ashton and D. Hallam, eds), Canberra, National Museum of Australia, pp. 379-387.Marabelli, M. and G. Napolitano (1991) Nuovi sistemi protettivi applicabili su opere o manufatti in bronzo esposti all'aperto. Materiali e strutture Vol. 1, No. 2, pp. 51-58.Marabelli, M., Mazzeo R., (1993) La corrosione dei bronzi esposti all'aperto: problemi di caratterizzazione, La Metallurgia Italiana 4, Vol.85, pp. 247-254.Matteini M., Moles A., Tosini I. (1988) Analisi dei composti di alterazione per cromatografia ionica, in Donatello ed il restauro della Giuditta, Firenze, pp. 106-110.Matteini M., Moles A., Tosini I. (1991) Controllo dei componenti solubili delle patine me-diante cromatografia ionica ed assorbimento atomico, oPD Restauro 3, pp. 40-46.Matteini M., Moles A., Nepoti M.R. (1991) Caratterizzazione dei prodotti di alterazione mediante spettrofotometria IR, OPD Restauro 3, pp. 36-39.Mazzeo R., Chiavari G., Morigi G. (1989) Identificazione ed origine di patine ad ossalato su monumenti bronzei: il caso del Portale Centrale del Duomo di Loreto (AN). In Atti del Convegno Le Pellicole ad ossalati: origine e significato nella conservazione delle opere d'arte, Milano 25-26 Ottobre 1989, pp. 271-279.Mazzeo R., Carruba A.M., Chiavari G. and Parisi Presicce C. (2004) The conservationrestoration of the Capitoline She-Wolf: stratigraphic characterisation of the alteration and deposition materials present on the famous bronze statue, symbol of Rome. In Metal 2001, Proceedings of the International Conference on Metal Conservation, Santiago, Chile 2-6 April 2001, Ed. I.D. MacLeod, J. M. Theile, C. Degrigny, Western Australian Museum, pp. 34-43.Mazzeo R., Joseph E. (2004) Micro-destructive analytical investigation for conservation and restoration, In, Monumenti in bronzo all’aperto. esperienze di conservazione a confronto (con CD-ROM allegato), a cura di P. Letardi. I. Trentin, G. Guida, pp.53-58, Nardini Editore – Firenze.Mazzeo R, Joseph E (2004) Micro-destructive analytical investigation for conservation and restoration. In Monumenti in bronzo all’aperto. esperienze di conservazione a confronto. A cura di Letardi P., Trentin I., Guida G., Nardini Editore (Firenze), pp. 53-58.Mazzeo R. (2005) Patine su manufatti metallici, In Le patine: genesi significato e conservazione, Nardini Editore, Kermesquaderni, pp.29-43.Mazzeo R. and Joseph E. (2005) The use of FTIR micro-ATR spectroscopy and FTIR mapping for the surface characterisation of bronze corrosion products. In Proceedings of Art’05, 8th International Conference on Non-Destructive Investigation and Microanalysis for the Diagnostics and Conservation of Cultural and environmental Heritage. Lecce (Italy), 15-19 May 2005 (CD-ROM format).Mazzeo R. and Joseph E. (2007) Attenuated total reflectance microspectroscopy mapping for the characterisation of bronze corrosion products. In european Journal of Mineralogy, Vol. 19, No.3, pp.363-371.Mazzeo R, Prati S, Joseph E (2008). Falsificazione di bronzi orientali in estremo oriente. in: vero e falso nelle opere d'arte e nei materiali storici: il ruolo dell'archeometria. Roma, Bardi editore, pp. 141 – 160.Mello E., Parrini P. (1982) Lorenzo Ghiberti: storie di Giuseppe e Beniamino; storie di Adamo ed Eva. Stato di conservazione, esame di una microcarota. in Metodo e Scienza, operatività e Ricerca nel restauro, Firenze 23 giugno 1982 - 6 gennaio 1983, pp. 176-178.Robbiola, L., Portier, R. (2006) A global approach to the authentication of ancient bronzes based on the characterization of the alloy-patina-environment system, Journal of Cultural Heritage Vol. 7, pp. 1-12.Van Langh, R., James, J., Burca, G., Kocklelmann, W., Zhang, S.Y., Lehmann, E., Estermann, M., Pappot, A. (2011) New insight into alloy composition: studying Renaissance bronze statuettes by combined neutron imaging and neutron diffraction techniques, Journal of Analytical Atomic Spectroscopy Vol. 26, pp. 949-958. http://www.nrich.go.kr/eng/Science/Metal.jsp;EN ISO 11341: 2004 - Artificial weathering and exposure to artificial radiation (ISO 11341:2004).EN ISO 9227: 2006 - Corrosion tests in artificial atmospheres. Salt spray tests (ISO 9227:2006).