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<p>[QUOTE=&quot;Bob Evancho, post: 5261127, member: 84595&quot;]HI.&nbsp; Keep this in mind.&nbsp; ANY acid that will react with copper will eventually environmentally damage a coin that has copper in its composition.&nbsp; Whether it is from a gold and silver testing kit or even PVC poly vinyl Chloride which breaks down into the chloride/chlorine acid.&nbsp; In one of my previous posts, I mention an ANA graded coin from the 1970&#039;s that they graded and put into a PVC heat sealed flip.&nbsp; When I got to it a couple years ago (after 40 years being in my safe deposit box), the PVC oils had leached onto the Proof 1937 Australian Crown.&nbsp; Even after many baths in Acetone, The PVC oil had microscopically attacked the copper in the sterling silver crown. Ask questions here first before you do anything.&nbsp; The experts on Coin Talk will steer you in the right direction. Enjoy your coin collecting.[/QUOTE]</p><p><br /></p>

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