Green mold on copper coims

[coindabbler]

Hi, I was recently given $13 of relatively new cents (1960's to 2011). Most of them have green mold spots or major cases of the copper mold.

How do I get rid (clean up) this contamination. Does anyone have a home brew that will
stop the deterioration of the coins.

Thanx in advance

David

[Bill in Burl]

If it's soft, then acetone. If hard, there is nothing you can do as it has chemically corroded the metal.