More important than the holder is the environment. I live in an area of the west that tends to be very dry and I store my collection in an area that has a stable year round temperature. I have essentially zero toning on my coins even though many of them are not in any sort of airtight container.
Coin World holders should be ok for the coin but keep them as dry as possible and keep the temperature steady.
Coin World holders should be ok for the coin but keep them as dry as possible and keep the temperature steady.


















