Concerning Poly's - Coin Community Forum

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Author	Replies: 3 / Views: 1,119
Stephen420 Valued Member United States 411 Posts	Posted 05/09/2006 2:37 pm Does anyone have experience with storing coins long term in polyethylene bags? I don't do that anymore, but some of my coins (up until recently) have been in poly's for a while. I recently took one out to look at it and noticed PVC damage. I verified this by showing the coin to my local dealer. The coin came in a cardboard 2x2, and I don't know how long it was in that holder. I use saflips now and for more permanent storage, I've been using a holder that I don't know the name of, but you see it advertised as the only holder where you can see the "third" side of a coin - i.e., the edge. Those are nice. Report this Post to the Staff

ChristinaM Pillar of the Community United States 547 Posts	Posted 05/10/2006 03:11 am I dont believe that they would damage your coins. Mylar's 'real' name is "polyethylene terephthalate". So the polyethylene bags probably isn't what caused the PVC damage to your coins. PVC can be broken down by light or heat into hydrochloric acid or chlorine gas which is what damages the metal in coins. Polyethylene is basically inert to coins. Sorry is this was too much info...I was a chemistry major Hope this helps! Report this Post to the Staff
scoutjim99 Pillar of the Community United States 4589 Posts	Posted 05/10/2006 03:22 am No dont say sorry thank you I just learned something else today Report this Post to the Staff
ChristinaM Pillar of the Community United States 547 Posts	Posted 05/10/2006 05:50 am The cholrine in the PVC is what turns your coins that green color. Another thing you need to watch out for is sulfur (in coin envelopes, albums, etc.) Sulfur reacts especially with copper coins..forming copper sulfate which sometimes leads to ugliness in the toning on copper coins. Sulfur also reacts with the alloys that are in silver coins..this usually leads to some kinds of toning that you see on silver. Report this Post to the Staff
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