Section 4: Composite artefacts (PDF 20858kb) - National Museum of ...

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Proceedings of Metal 2004 National Museum of Australia Canberra ACT 4–8 October 2004ABN 70 592 297 967Leene, J. E.,(1963) Restauración y preservación de textiles antiguos y ciencias naturales, RecentAdvances in Conservation , trad. Alyson Davis.Madrid, R., Gabriel, L.,(1995) Sistema constructivo de las esculturas novohispanas talladas en madera,tesis, Chrubusco, Mexico.Museo Municipal de Arte Hispanoamericano (1970) Devoción y sugestión de las imágenes de vestir,biblioteca Chrubusco FTS/20-26, Mexico.Salas, E.P.,(1965) Historia del arte en el reino de Chile , Universidad de Chile, Santiago.Stanley, C.S.,(1965) The interpretation of microstructure of metallic artifacts, in Application of sciencein examination of works of art. Museum of fine Arts,page 13-52, Boston.The Getty Conservation Institute (1991), Ancient and Historic Metals, Conservation and scientificresearch, Proceedings of a Symposium.Theile, J.M.,(1998) Analysis and restoration of chilean silverware of the colonial period, Proceeding ofICOM-CC Metal Congress Draguignan, France, page 60-63.Theile, J.M.,(2003) Restauración del Patrimonio Cultural, Universidad de Chile.von Bennewitz, R.M.,(1999) Mapuches Silver, editorial Kactus.© Published by the National Museum of Australia www.nma.gov.au513
Proceedings of Metal 2004 National Museum of Australia Canberra ACT 4–8 October 2004ABN 70 592 297 967Cremated: Analysis of the metalwork from an Iron Age graveV. Fell aa English Heritage, Centre for Archaeology, Fort Cumberland, Eastney, Portsmouth PO4 9LD, UK__________________________________________________________________________________________AbstractThe grave finds from an Iron Age cremation in southern England include a group of iron implements and acopper pin. The condition of the metalwork is quite exceptional. Surface deposits on the iron implementsreveal traces of haematite, whereas the copper pin is covered in a thick layer of tenorite. These deposits are hightemperature oxidation products deriving from the cremation pyre rather than from corrosion processes.RésuméLes trouvailles d’une tombe à incinération de l’age de fer dans le sud de l’Angleterre inclurent un groupe desinstruments en fer et une épingle en cuivre. La condition de préservation de ces objets de métal est bienexceptionnelle. Des couches sur la surface des instruments de fer contiennent de hématite tandis que l’épingleen cuivre est couvrit d’une forte couche de ténorite. Ces couches sont les résultats d’oxydation à hautestempératures provenant plutôt du bûcher de crémation que des procès de corrosion.Keywords: haematite, tenorite, XRD, XRF, SEM1. IntroductionA group of implements, probably part of a craftsman’s tool kit, was recovered with a cremation burial at theprehistoric site at White Horse Stone, Kent, in southern England (Figureure 1). The cremation is radiocarbondated to 490 – 160 cal BC. The shallow cremation pit was excavated in 1998 by Oxford Archaeology inadvance of extensive development for the channel tunnel rail link, for CTRL (UK) Limited.The group of implements comprises two iron knives, four iron awls and a whetstone, plus a small loopheadedcopper pin. The awls may well have been used for working skin products, conceivably untanned hiderather than leather owing to their large size, or coarse textile. The small knife would be very suitable for cuttingskin, leather or fibres. On balance however, it seems possible that the implements once formed part of a tool kitof a skin or leather worker.The condition of the metalwork is quite exceptional. The iron implements are only superficially corroded, withfine surface detail preserved and clearly visible under the chalky soil deposits. For example, the larger knife hasa clear bevel on both sides of the cutting edge. The tips of the awls remain sharp and their tangs are pristine.However, there is no evidence of any associated mineralised organic materials such as handles. Instead, thereare small areas of bright red deposits near to or on the tangs of four of the six iron implements. Anotherdistinctive feature of the awls and larger knife is the dense and lustrous, dark grey to black appearance ofthe metal surface under the soil (or under the red deposits).The non-ferrous metal pin is covered with a thick layer of porous black powder with occasional green areasvisible. As a consequence of its appearance, the pin was initially thought to be made of a silver alloy.It is generally assumed that bright red deposits on archaeological ironwork are often haematite resulting fromburning in oxidising atmospheres. This red colour is invariably present on freshly forged iron together with avery smooth and compact black oxide layer. One of the first people to comment on the presence of haematite on__________Corresponding author: TEL: +44 2392 856787: FAX: +44 2392 856701: email: vanessa.fell@englishheritage.org.uk© Published by the National Museum of Australia www.nma.gov.au514
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Section 4: Composite artefacts (PDF 20858kb) - National Museum of ...

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