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<p>[QUOTE=&quot;Paul M., post: 2601919, member: 73165&quot;]OP, the good news is that it looks like these coins aren&#039;t super valuable collectible coins.&nbsp; The bad news is that baking soda and aluminum foil cause an electrochemical reaction on the silver.&nbsp; It has stripped any protective oxide/sulfide layer from the coins, so they may tone significantly in the near future.</p><p><br /></p><p>The green stuff looks like PVC residue, and, yes, it comes from being in holders of the wrong kind of plastic.&nbsp; The other &quot;good&quot; news here is that with the green being so far gone, the PVC had likely already damaged the surface of the coins, so there was little you could have done to hurt them in the first place.</p><p><br /></p><p>The proper way to conserve coins with PVC residue is to soak them in acetone.&nbsp; This dissolves the PVC and is completely safe for the coin, provided you don&#039;t rub the coin dry (just let it air dry).[/QUOTE]</p><p><br /></p>

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