Dark spot

Hi,

After being encapsulated in an NGC holder for almost a year, I noticed today that my ABC peso has developed this dark spot which it did not used to have. What likely happened?

Thank you!
Ben

 

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Life! And toning. Where do you store this most marvelous coin? The holder is not air tight, and subject to the elements that would render 'toning'.......

 

Must have been some "clear" liquid/residue/foreign substance on the coin prior to grading and the storage temp helped it "appear".

 

I had a similar thing happen to this coin (apologies for the difference in color temp, I'm not sure if that's an editing thing or a coin thing):

(this is what it looked like when I sent it to them)



(this is what it looked like when I got it back in the slab - note the green spot to the right of the portrait)

 

That looks like a spittle spot

 

Yeah, but I feel like I waited too long to call them and complain, so now I’m stuck with a gorgeous coin with a green booger on it. (Sad face emoji)

 

Some type of organic contamination.

 

Sorry to see that - it was (and still is) a heck of a score and a gorgeous coin.

 

Carbon spots are my least favorite damage outside of staple scratches. I would even prefer a finger print.

 

Unfortunately probably true. That usually is something that needs to be brought up quickly

 

Thank you for all the responses! It’s intresting how things like this develop over time

 

With high karat gold coins, acetone or ketone might help without endangering the coin metal. I have used E-zst on some 'bugged' gold coins and it all came off ok. The coin did lighten a little but I suspect it was from a tobacco user film.