Yeah, that looks like PVC -- pretty advanced growth as well.
I'd try a long soak in acetone, but a couple addtional soaks in fresh acetone to make sure it is allgone. It will probably leave some damage behind, but hopefully not enought to bag it.
You've got very significant PVC contamination on the reverse of your coin from 12:00 to 4:00 -- it's that stuff that loooks like green moss or algae on your photograph.
A gentle acetone wash should help to dissolve it and not harm the coin. If your eyesight is not good enough to see it, perhaps you should get someone with sharper eyes to bathe the coin for you.
Stuart
Collect 18th & 19th Century US Type Coins, Silver Dollars, $20 Gold Double Eagles and World Crowns & Talers with High Eye Appeal
"Luck is what happens when Preparation meets Opportunity"
Comments
Keeper of the VAM Catalog • Professional Coin Imaging • Prime Number Set • World Coins in Early America • British Trade Dollars • Variety Attribution
I'd try a long soak in acetone, but a couple addtional soaks in fresh acetone to make sure it is allgone. It will probably leave some damage behind, but hopefully not enought to bag it.
A gentle acetone wash should help to dissolve it and not harm the coin. If your eyesight is not good enough to see it, perhaps you should get someone with sharper eyes to bathe the coin for you.
Stuart
Collect 18th & 19th Century US Type Coins, Silver Dollars, $20 Gold Double Eagles and World Crowns & Talers with High Eye Appeal
"Luck is what happens when Preparation meets Opportunity"
<< <i>My eyes aren't so good. >>
Now I just realized the OP may have been a tad sarcastic.
S
<< <i> Do you see anything?
>>
Not anymore.
I've been blinded.