Is it humid where you have these coins Ron?
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Rio de Janeiro has beaches and small mountains. It is not a dry place, but not too humid.
I only have your pictures to go by but it looks to me like those speckles and strange toning is very typical of moisture in the air. Could be the salty air from the ocean if you are fairly close. Especially that green on the CC you showed.
If I send them to NGC, will it be possible for them to restore the original coin and then slab them or moisture prevents them to restore the coins?
I really hate humidity @silverd520....
It effects everything....
Working with wood I’m sure you see this too!
Living in a Pacific Northwest rain forest the only time relative humidity drops down to 55 percent is in the Winter !🙃