By David A. Scott, Jerry Podany, Brian B. Considine
The upkeep and learn of metals when it comes to the issues of degradation and applicable equipment of exam and remedy 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. 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 through the Iron Age in southern Africa.
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Additional resources for Ancient & Historic Metals: Conservation and Scientific Research
Lab MAH 87-194. follows. The bronze alloy corrodes by selectively eliminating copper, which is redeposited as chalcopyrite on the surface (Fig. 2b). There is an enrichment in the tin content due to the preferential corrosion of copper in the alloy (Fig. 2c). The corrosion layer does not contain any tin. Sulfur and iron are distributed in exactly the same manner (Fig. 2d). They have diffused slightly into the corroded areas of the bronze and are evenly distributed in the corrosion layer. An element scan shows that the corrosion layer contains only copper, iron, and sulfur.
Makovisky and Skinner, Am. Mineral. 5 mm, Fe radiation unfiltered, 30 kV, 14 mA, 15 thetic crystal. hours. Film Lab MAH No. 302. e b Natural History Museum, Geneva. 5 mmø, Same sample as noted above X-rayed by S. Graeser, Natural History Sample from Victoria Mine, Westphalia, obtained from J. Deferne, Museum, Basel. Fe radiation, 8 hours. Film Lab MAH, No. G 451p. Fe radiation unfiltered, 30 kV, 14 mA, 17 hours. Film Lab MAH c No. 427. Sinnerite sample from the Lengenbach mine near Binn in the Valais, Switzerland.
G 451p. Fe radiation unfiltered, 30 kV, 14 mA, 17 hours. Film Lab MAH c No. 427. Sinnerite sample from the Lengenbach mine near Binn in the Valais, Switzerland. X-rayed by S. Graeser, National History Museum, Basel. f Fe radiation, 8 hours. Film Lab MAH No. G 452p. Mines, Germany. 38 Ref. 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.
Ancient & Historic Metals: Conservation and Scientific Research by David A. Scott, Jerry Podany, Brian B. Considine