A while back, there was a discussion of lenses yellowed by radioactive elements
in their glass.
(I don't have it with me, on my laptop - sorry.)
For those interested in the subject, a very detailed article has popped up on
Petapixel. More on the subject that most of us will ever want to know.
https://petapixel.com/2021/08/10/radioactive-lenses-and-everything-about-them/
Enjoy!
David.
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