JN
J. Nienhuis
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2 records found
1
Artefact biography 2.0
The information value of corroded archaeological bronzes
The different phases in the life of archaeological objects can be described by artefact biography. This dissertation defines an updated version: artefact biography 2.0, and the life phases of Early Iron Age bronze studs from Oss-Zevenbergen, the Netherlands, are elaborated. Throughout the thesis, the research revolves around information value.
The bronzes have been studied from an interdisciplinary point of view, which has allowed the extraction of information that is also applicable to other corroded bronzes in general. It is argued that:
- corrosion products and inclusions may reflect original microstructure
- corrosion inhibitor BTAH binds to Sn and SnO2
- technical investigations before conservation increase the information value of an artefact. ...
The bronzes have been studied from an interdisciplinary point of view, which has allowed the extraction of information that is also applicable to other corroded bronzes in general. It is argued that:
- corrosion products and inclusions may reflect original microstructure
- corrosion inhibitor BTAH binds to Sn and SnO2
- technical investigations before conservation increase the information value of an artefact. ...
The different phases in the life of archaeological objects can be described by artefact biography. This dissertation defines an updated version: artefact biography 2.0, and the life phases of Early Iron Age bronze studs from Oss-Zevenbergen, the Netherlands, are elaborated. Throughout the thesis, the research revolves around information value.
The bronzes have been studied from an interdisciplinary point of view, which has allowed the extraction of information that is also applicable to other corroded bronzes in general. It is argued that:
- corrosion products and inclusions may reflect original microstructure
- corrosion inhibitor BTAH binds to Sn and SnO2
- technical investigations before conservation increase the information value of an artefact.
The bronzes have been studied from an interdisciplinary point of view, which has allowed the extraction of information that is also applicable to other corroded bronzes in general. It is argued that:
- corrosion products and inclusions may reflect original microstructure
- corrosion inhibitor BTAH binds to Sn and SnO2
- technical investigations before conservation increase the information value of an artefact.
Curly malachite on archaeological bronze
A systematic study of the shape and phenomenological approach of its formation mechanism
Journal article
(2016)
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Janneke Nienhuis, Luc Robbiola, Roberta Giuliani, Ineke Joosten, Hans Huisman, Bertil van Os, Jilt Sietsma
Curly malachite (CM) is found as a green cupric carbonate hydroxide corrosion product on archaeological bronze, mostly on artefacts retrieved from graves. In this paper, a morphological characterization approach is proposed, enabling the investigation of the formation process of CM. It is suggested that curly malachite precipitates from an aqueous solution, for which the surrounding soil conditions provide local triggers. Anthropic activities associated with ritual burials do not significantly affect the growth of CM. It is also confirmed that curly malachite is usually not a pseudomorph of formerly organic material. Although the understanding of the formation process is far from complete, this study has shown that CM is expected to be found more often than is currently recognized, due to its relatively simple formation mechanisms and boundary conditions.
...
Curly malachite (CM) is found as a green cupric carbonate hydroxide corrosion product on archaeological bronze, mostly on artefacts retrieved from graves. In this paper, a morphological characterization approach is proposed, enabling the investigation of the formation process of CM. It is suggested that curly malachite precipitates from an aqueous solution, for which the surrounding soil conditions provide local triggers. Anthropic activities associated with ritual burials do not significantly affect the growth of CM. It is also confirmed that curly malachite is usually not a pseudomorph of formerly organic material. Although the understanding of the formation process is far from complete, this study has shown that CM is expected to be found more often than is currently recognized, due to its relatively simple formation mechanisms and boundary conditions.