By David A. Scott, Jerry Podany, Brian B. Considine
The upkeep and research of metals when it comes to the issues of degradation and acceptable equipment of exam and therapy more and more contain collaboration among scientists and conservators. The 16 essays during this quantity specialize in real items from a variety of sessions and cultures. members comprise Thomas Chase of the Freer Gallery in Washington, D.C., at the expertise of chinese language bronze casting; Paola Fiorentino of the Istituto Centrale del Restauro in Rome at the conservation of the equestrian statue of Marcus Aurelius; Knud Holm of the nationwide Museum of Denmark at the recovery of nineteenth-century zinc sculptures; Ian MacLeod of the Western Australian Maritime Museum at the conservation of metals from underwater websites; and W. Andrew Oddy of the British Museum at the use of gold foil and cord in the course of the Iron Age in southern Africa
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Extra resources for Ancient & Historic Metals: Conservation and Scientific Research
1 The first series of objects was analyzed using the five questions outlined above as a central focus. The second series contained objects that were used for metallographic examinations and for the investigation of corrosion mechanisms. The site of Hauterive-Champréveyres contains five different archaeological layers (Rychner 1991): Layer 1: Yellow, sandy layer of recent origin, probably formed by washing out the lower (older) layers, and containing artifacts from these layers. 55. Layer 2: Lake sediment of sand and clay.
As far as metal artifacts are concerned, research has been centered mainly on the examination of metal alloys and the history of technologies. Considering all these investigations, it is surprising that little attention has been paid thus far to the composition and structure of corrosion layers on metals as an opportunity for archaeometric research. The aim of this contribution is to show that there is a close link between the composition of patinas and the environments in which they are formed.
Electron- microprobe analyses of the corrosion layer of a bronze Bronze Bronze int. crust Int. crustb Ext. 94 Hauterive-Champréveyresa Pb % nd nd nd nd _____ (Lab MAH 87-194). 99 a Analyses by R. Oberhänsli, Mineralogical-petrographical Institute of the University of Berne, Switzerland. Mean values of 3 measurements. c Mean values of 5 measurements. d nd=not detected. b 40 BRONZE OBJECTS FROM LAKE SITES on microbial corrosion of nonferrous metals has been published by McDougall (1966). For archaeological copper-tin alloys, Tylecote published a short note in his excellent paper on the effect of soil conditions on the long-term corrosion of buried bronze alloys (1979:352).
Ancient & Historic Metals: Conservation and Scientific Research by David A. Scott, Jerry Podany, Brian B. Considine