1971 JFK Half - inner layer eroding? 0

[Woods020]

I got this half today when I stopped by my bank. I’ve started asking for any they have when I’m in there. This one is a strange one. The inner layer seems to be eroding. It is consistent around the full coin, and reeding is present in most of the corroded areas even though I can’t get it to show in pictures. Any idea what causes this?

[l.cutler]

Some acids will do that, it attacks the copper core more than the copper nickel outer layers.

[Just Bob]

6 hours ago, l.cutler said:

Some acids will do that, it attacks the copper core more than the copper nickel outer layers.

Yep

[James_OldeTowne]

On 9/16/2020 at 6:21 PM, l.cutler said:

Some acids will do that, it attacks the copper core more than the copper nickel outer layers.

Yep, that's exactly right.