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Message:: [QUOTE="Bone Head, post: 939194, member: 14057"]The green death, PVC It states on the packaging that they are vinyl flips. That means poly vinyl chloride or PVC. And it does smell like a shower curtain.Some say it's OK to use them for shipping or short term storage. I disagree. Here's why.  I think sharp edges as found on some uncirculated and more often on proof coin can shave off tiny pieces of the flip when they move around inside. I'm pretty sure this happens with the hard flips because you can see the little pieces and specks of plastic and scratches inside the flip, no? It's not a big problem with inert flips,but these tiniest of pieces, easily overlooked, can cause BIG problems for your prized coins. PVC residue can be removed, or so  says NCS (National Conservation Service), that worked with NGC untill recently when NGC bought them out.  But the damaged to the coins surface cannot be repaired. And if the cleaning (oops, I mean conservation) is improperly or incompletely done the PVC will grow back and destroy whats left of your coin. The green death is real and it is caused by PVC. This we know. So why  gamble?  I'm not sure but  I suspect that coins in paper envelopes stored in vinyl flips are also in danger from the vapors. (can you smell it?) .... Thanks MAT for a good question on an important and too often overlooked topic.. ..  my opinion, I welcome further discussion.[/QUOTE]