Here's a quick tip. Do not hold your coins in 2x2's together with rubber bands. Why? The mylar windows will be pressed hard against the coin surface and chemicals will leech through the mylar from the rubber band to the coin causing toning of the coin. I first read about this a while back on the now defunct Aussie Coin forums and quickly undid all of the bulk 2x2's I had held together with rubber bands. I've been telling people not to do it since. A short while back someone on the PCGS World and Ancient Coin Forums disagreed with me and told me that mylar is permeable in such small amounts as to make my theory rubbish. Rather than argue I kept quiet and thought perhaps I was wrong.
Well now I read on the Coin Community Forums that someone has seen exactly the same thing! I've quoted the whole post below with the relevant area in bold. There's a direct link to the post here, it probably wont stay live for long though.
Up for sale are 8 beautiful 2008 "Inaugural Year" Austrian Vienna Philharmonic Silver 1oz Coins. BU Rebublik Osterreich 1.5 Euro Face Value 1 Unze Feinsilber First Euro Denominated Silver Bullion CoinEach coin will come in oversized 2x2 in bubble mailer
I also have 2 Ugly Toned 2008 Philharmonics. Occurred from using rubber band to hold 2x2s together (toning is on one side of coin) Bullion is Bullion Right!
So there you have it! Don't wrap up your coins in 2x2's with rubber bands. They can cause your coins to tone, and tone quickly, this example shows 2008 coins toning in little more than a year!
Posted by mnemtsas at June 4, 2009 8:03 AM
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