Why do glasses nose pads turn green?

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Tags

1. #around
2. #lenses
3. #inside
4. #accumulate
5. #eyeglass
6. #unsightly
7. #moisture
8. #cause
9. #covers
10. #dampen
11. #replaced
12. #cotton
13. #reach
14. #metal
15. #frames
16. #oxidize
17. #places
18. #green
19. #clean