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 protection and examine of metals when it comes to the issues of decay and applicable tools of exam and therapy more and more contain collaboration among scientists and conservators. The 16 essays during this quantity concentrate on real items from a variety of classes and cultures. members comprise Thomas Chase of the Freer Gallery in Washington, D.C., at the know-how 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 twine throughout the Iron Age in southern Africa.

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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.

The monument of Marcus Aurelius after restoration. 29 FIORENTINO In 1912 Apolloni, who was restoring the monument at that time, carefully recorded the presence of ancient graffiti on its surface in the form of letters, crosses, symbols, and various figures left by pilgrims who visited Rome in the Middle Ages (Apolloni 1912). Of all those graffiti, only one remains: a barely perceptible star on the horse’s raised hoof (Fig. 10). This causes one to contemplate the remarkable survival of this monument thus far and the loss for future generations if it were to be erected again FIGURE 10.

Tions and repairs. Obviously, the restoration of such a degraded and mistreated monument involved other, less exacting operations, such as a more thorough elec- FIGURE 6. Same area as in trochemical cleaning of the internal areas with pitting,5 or retouching the patina of Figure 5, after cleaning, the Renaissance repairs which, being of a different and better-preserved alloy, were below right. darker and did not match that of the restored monument. 27 FIORENTINO O B S E RVAT I O N S A N D C O N C L U S I O N S The cleaning treatments used in this restoration of the statue of Marcus Aurelius have made the monument more aesthetically pleasing and, at the same time, have revealed some unresolved conservation problems.

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