Glasses frame is usually made of a type of copper called monel. Monel is a table metal and unreactive towards a lot of chemical. It is also skin friendly. The only downside is that it turns greenish when it gets rusty.
[edit] It’s interesting that that article suggests a way to clean them–but the Costco optician just now said you can’t really clean them. (They replaced them for no charge.)
https://www.pottglasses.com/green-dirt-on-eye-glasses/
No more calls; we have our winner.
Glasses frame is usually made of a type of copper called monel. Monel is a table metal and unreactive towards a lot of chemical. It is also skin friendly. The only downside is that it turns greenish when it gets rusty.
[edit] It’s interesting that that article suggests a way to clean them–but the Costco optician just now said you can’t really clean them. (They replaced them for no charge.)
I always thought it was moss, and that it was a sign I should go out more.
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(I would have gone with this one instead.) 😜