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Where is All the Amalgam Silvering?

Published online by Cambridge University Press:  26 February 2011

Kilian Anheuser
Kilian Anheuser*
Affiliation:
Department of Materials, Oxford University, Oxford, United Kingdom
*
1 Beueler Str. 49, 53229 Bonn, Germany
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Abstract

Amalgam gilding was one of the most common techniques for the gilding of metalwork before the invention of electroplating. Its silver equivalent, amalgam silvering, was executed in the same manner, by applying a paste of silver amalgam and mercury to a copper alloy object and subsequent heating to form a diffusion bond between substrate and plating and to evaporate the excess mercury, followed by burnishing of the surface. The technical know-how was readily available. However, even though many medieval and post-medieval European metal objects were silver plated, only a few coins and small objects like medieval decorative mounts and horse trappings, and post-medieval astronomic instruments have been reported as examples of amalgam silvering. The technique was also used in China in the 3rd-1st century BC. Should we assume that there are many more amalgam silvered objects waiting to be discovered, as has been suggested? This paper investigates silver plated objects from 3rd century BC Chinese belt hooks to 18th century French decorative art and compares the analytical evidence with original silvering recipes and replication experiments, which showed that with amalgam silvering satisfactory results were far more difficult to achieve than with fire-gilding. It was found that the presence of mercury in XRF analyses of silver plated surfaces did not necessarily identify amalgam silvering, and that some allegedly amalgam silvered objects may in fact have been plated with silver chloride based electrochemical replacement silvering pastes.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 462: Symposium DD – Materials Issues in Art and Archaeology V , 1996 , 127
Copyright
Copyright © Materials Research Society 1997

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References

REFERENCES

1. Niece, Susan La, Antiquaries Journal 70, 102–114 (1990).Google Scholar
2. Niece, Susan La, in Metal Plating and Patination, edited by Niece, Susan La and Craddock, Paul (Butterworth-Heinemann, Oxford, 1993), pp. 201–210.Google Scholar
3. Oddy, Andrew, in Metal Plating and Patination, edited by Niece, Susan La and Craddock, Paul (Butterworth-Heinemann, Oxford, 1993), pp. 171–181.Google Scholar
4. Northover, Peter and Anheuser, Kilian, in Proceedings of the American Institute for Conservation Gilded Metals Symposium at St Paul (Minnesota). June 1995, edited by Drayman-Weisser, Terry, in press.Google Scholar
5. Anheuser, Kilian, DPhil thesis, Oxford University, 1996.Google Scholar
6. Janet Lang and Michael Hughes, J., in Argenterie Romaine et Byzantine, edited by Baratte, François (De Boccard, Paris, 1988), pp. 27–33.Google Scholar
7. Anheuser, Kilian, Numismatic Chronicle 156, in press.Google Scholar
8. Oddy, W. A., Padley, T. G. and Meeks, N. D., Archaeo-Physika 10, 230–242 (1979).Google Scholar
9. Bunker, Emmy C., Chase, Tom, Northover, Peter and Salter, Chris, in Outils et ateliers d'orfèvres des temps anciens. Antiquités Nationales Mémoire 2, edited by Eluère, Christiane (Musée des Antiquités Nationales, St-Germain-en-Laye, 1993), pp. 55–66.Google Scholar
10. Egan, Geoff and Pritchard, Frances, Dress Accessories. Medieval Finds from Excavations in London Vol. 3, (HMSO, London, 1991), cat. no. 933.Google Scholar
11. Toll, Christopher (ed./transl), al-Hamdânî: Kitâb al-Gauharatain / Die beiden Edelmetalle Gold und Silber, Studia Semitica Upsaliensia Vol. 1 (Almqvist & Wiksell, Uppsala, 1968). Text and German translation.Google Scholar
12. Dodwell, Charles Reginald (ed./transl), Theophilus: de diuersis artibus / The Various Arts, 1st ed. (Thomas Nelson, London, Edinburgh, Paris, Melbourne, Toronto, and New York, 1961). Text and English translation.Google Scholar
13. Smith, Cyril Stanley and Gnudi, Martha Teach (transl), The Pirotechma of Vannoccio Biringuccio (Dover, New York, 1990). English translation only.Google Scholar
14. Anonymus, Der Künstliche Gold- und Silber-Arbeiter. (Nuremberg, 1708). Copy in the British Library, London.Google Scholar
15. “Silvering from Lübeck, alledgedly quite good. Take 5/32 ounce of pure silver, ¼ ounce of borax, ¼ ounce of good salmiac, ¼ ounce of common kitchen salt, 3/32 ounce of mercuric chloride. Grind all this into powder in a mortar, add it to the water in which the silver is dissolved, together with warm water mixed with a little salt, do this three times, and let rest for an hour or two to allow the silver to precipitate. When the work is removed from the fire quench it in winestone-water. Do the silvering three times, finally boil with small pieces of white winestone.”Google Scholar