Hi. Can someone tell me why this 1959 Proof is developing spots? I don't get it. I have taken care to protect it and it seems to "grow". Are they "milk spots" or what!!? I appreciate any input.
It is very possible that it encountered some surface contaminants before you owned it. Carefully remove it from its holder, rinse it in acetone, and reholder it (the procedure for how to use acetone has been posted many times, just do a search here). Those don't appear to be milk spots, which are mint made and evident on the coin from its production. If they are growing, as you say, then it is something else.
What they both said. It has, to me, the hazy appearance of beginning PVC plasticizer contamination. I would therefore advise more than a mere "rinse" in acetone; give it a few hours.
Whew...thanks guys. so just to recap.....i'll let it soak in some acetone and then just rinse it in cold water? How long do i let it soak? Never done this to a coin?
Since it's a fairly common piece, I'd just dip it in E-Z-Est, rinse in tap water then rinse in distilled water and then 91% Isopropyl Alcohol before putting it back in a 2x2 after it is completely dry.
