Ancient & Historic Metals: Conservation and Scientific by David A. Scott, Jerry Podany, Brian B. Considine

By David A. Scott, Jerry Podany, Brian B. Considine

The maintenance and research of metals by way of the issues of decay and acceptable tools of exam and therapy more and more contain collaboration among scientists and conservators. The 16 essays during this quantity specialise in genuine items from a variety of sessions and cultures. individuals contain 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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5. Is it possible to retrace the history or the corrosion biography of an individual bronze object after its use? ORIGIN AND TYPE OF B R O N Z E M AT E R I A L A N A LY Z E D To determine the origin and type of bronze material on the objects, five small bronze objects were initially studied: four pins and a fishing hook. 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.

Nat. Bur. Stand. ) Monogr. 21 (1984). Sample from Merkur BRONZE OBJECTS FROM LAKE SITES FIGURE 1a–c. Cross sec- tion of a chalcopyrite lake patina on a bronze needle, showing (a) above left, unetched, bright field with layered structure on top of the metal; (b) above right, unetched, dark field with different zones in the corrosion layer; and (c) right, region etched with alcoholic FeCl3. Note grainlike area of the corrosion layer on top of the corrosion pit and its rootlike bottom in the latter image.

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. Layer 3: Layer containing different strata of organic material due to human activities. 7. 34 BRONZE OBJECTS FROM LAKE SITES TABLE 1. Data from analysis Lab MAH Genève of several bronze objects. Inv. No. Neuchâtel Object Patina type Archaeological layer 85-27 17'773 pin lake 1 85-28 3'389 pin lake and land 3 85-29 3'967 fishing hook lake 1 85-194 3'071 pin lake and land 1 86-77 18'603 pin lake and land 1 87-194 18'152 pin-needle lake 3 87-195 3'031 pin-needle land 1 87-196 6'567 metal piece lake 3 87-197 6'246 metal piece lake and land 1 1st series 2nd series Layer 4: Sandy stratum.

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