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The production technology of mineral soda alumina glass: A perspective from microstructural analysis of glass beads in Iron Age Taiwan

Wang, Kuan-Wen, Iizuka, Yoshiyuki, Jackson, Caroline·2022·PLOS ONE
DOI 10.1371/journal.pone.0263986PMC PMC8846499
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Abstract

Mineral soda alumina (m-Na-Al) glass is a common glass production group found around the Indo-Pacific region. In Iron Age Taiwan, its presence dates back to the early 1 st millennium AD. This research discusses m-Na-Al glass beads excavated from Iron Age sites in Taiwan. No production sites for m-Na-Al have been found, but microstructural analysis suggests m-Na-Al glass appears to originate around South Asia and is exchanged widely. SEM-EDS and EPMA were used to analyse red, orange, yellow, green and blue m-Na-Al glass. The microstructure of the glass shows the presence of plagioclase and alkali feldspar relics in the glass, suggesting a low manufacturing temperature. Copper-based colourants are identified in red, orange, blue and green glass, while lead tin oxide is used in yellow and green glass. It appears that various types of copper-containing raw materials were procured by craftspeople, and a self-reduction process for producing red and orange glass is tentatively proposed. Additionally, the microstructure of yellow glass reveals different colouring paths were used. These results increase our understanding of the selection of raw materials, and provide an impetus for further research on the cross craft interaction between glass and copper production.

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Metadata

Authors
Wang, K.-W., Iizuka, Y., & Jackson, C.
ORCID
Wang, Kuan-Wen
Venue
PLOS ONE
Publisher
Public Library of Science (PLoS)
Published
2022-02-15
Volume
17
Issue
2
Pages
e0263986
ISSN
1932-6203
DOI
10.1371/journal.pone.0263986
PMC
PMC8846499
Cited by
6
References
0
Language
en
Licence
creativecommons.org/licenses/by/4.0/ (vor)

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