A lovely Anglo-Saxon glass beaker, found in Lincolnshire & rendered iridescent by time; now in @collectionusher :)pic.twitter.com/dQqqVrhoNe
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it looks like metals in the glass (maybe used to colour it) have oxidised over time & produced these colours.
brief explanation in link :) "It occurred when a vessel was buried in soil that leached the alkali from the glass" etc
twitter is wonderful, isn't it :-)
It's awesome, wonderful way to learn new things! :) So pleased I decided to give it a go!
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