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

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

ISBN-10: 0892362316

ISBN-13: 9780892362318

The protection and examine of metals when it comes to the issues of degradation and applicable tools of exam and therapy more and more contain collaboration among scientists and conservators. The 16 essays during this quantity concentrate on genuine items from quite a lot of sessions and cultures. individuals contain 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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Extra info for Ancient & Historic Metals: Conservation and Scientific Research

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3). These twelve areas were used to evaluate the efficacy and suitability of washing with demineralized water. The purpose of the washing was to extract the harmful soluble salts contained in the corrosion patinas, as well as to remove any residue from chemical cleaning agents. The use of demineralized water avoided any damage to the gilding and the more stable corrosion patinas. The twelve areas chosen had the following characteristics: • relatively compact and sufficiently visible gilding • gilding clearly covered with black alterations • alteration both exposed and not exposed to rain • zones with geodetic lines • alterations where rainwater converged • alterations in the insides of castings Washing was carried out with standard methods, using 100 ml fractions of FIGURE 3.

The monument was already being discussed in the Middle Ages, when it stood in front of the cathedral of Rome as the image of Constantine, the first Christian emperor, symbolizing Rome’s continuity of power and prestige from the pagan to the Christian world (Marco Aurelio: Storia di un monumento e del suo restauro 1989). ). It was never buried or excavated; rather, it has gone through a series of relocations in the open environment. The pedestal on which it rests has often been altered; in fact, it has been completely replaced several times throughout history.

For the formation of the gold- and black-colored sulfides, they postulate two possibilities: (1) precipitation reactions with copper and ions in the soil, and (2) direct action of hydrogen sulfide on the metal-oxide surface. Based on the foregoing, and in the absence of electrochemical investigations, the formation of the chalcopyrite corrosion layers may be described as follows: 1. Sulfate-reducing bacteria produce hydrogen sulfide in the organically rich soil close to the metal artifacts. It is unlikely that they grow on the bronze alloy, as they normally cannot resist more than 2,000 ppm of copper (McDougall 1966:11).

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