Replying to @mzxio
Dr Caitlin Green Retweeted Dr Caitlin Green
It's due to a chemical reaction in the soil, see https://twitter.com/caitlinrgreen/status/756233021150199808 … :)
Dr Caitlin Green added,
Dr Caitlin Green @caitlinrgreen
Replying to @caitlinrgreen
Iridescence=due to centuries spent buried in the ground, see http://www.toledomuseum.org/kiosk/ancient-asian-european-glass/ancient-glass/ancient-glass-in-the-study-gallery/why-is-some-ancient-glass-iridescent/ … eg Roman glass jar, 1st-2ndC AD pic.twitter.com/mSZl92r1nl
0 replies
1 retweet
5 likes
Loading seems to be taking a while.
Twitter may be over capacity or experiencing a momentary hiccup. Try again or visit Twitter Status for more information.