airtite for quarter size question

This has all been really informative. Thank you, everyone.

 

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Another theory I have going is maybe the coins were dipped and not properly rinsed, and those chemicals caused a breakdown of the black insert where it came in contact with the coins.

 

Yeah I could see what John said happening under abnormal conditions (ie ripoff air-tites or external factors like chemicals). But it probably does not happen otherwise.

This is a good thread. Thanks for the info everyone.