Your own experience with toning on coins you hold long term - what is it?

SanctionII

I have coins I collected as a YN that have been in Whitman Albums. Some have toned up nicely, particularly MS coins with silver in them.

Since getting back into collecting as an adult, I have acquired coins (silver, nickel, copper, clad, MS, SMS, circulated and proof) and have stored them in flips, cointains, Capital Holders, Whitman snap lock holders, OGP, Whitman albums, Dansco Albums, LOC albums, paper envelopes, etc. Some of the coins have been stored in the same container for over 10 years.

In general coins stored in flips and contains have not toned at all. Toning has occurred to some extent on some coins stored in other storage containers. Circulated coins have toned the least. MS coins have not toned as much as proofs. Many of the proofs have developed rim toning. Surprisingly some of the most extensive and most attractive toning has occurred on some of the SMS coins and on the clad proof coins.

How about you?

DeepCoin

I had an interesting experience with Silver American Eagles. A couple of years ago I bought a box of 100 SAEs from the Mint. I did not open them for quite a while and they remained in the original shipping box unopened. It was my idea to sell them as a lot and being unopened might bring more.

Well, things turned out differently and I decided to part them out individually. When I opened the box, one of the coins had come out of its box and was lying loose. Interestingly, it had acquired vivid toning. The kind some people call AT. Now I did nothing to the box and the rest of them were the usual brilliant white coins you get from unc SAEs.

The toned coin sold for 30 percent more on eBay than the rest of them.... interesting

Mowgli

I do Danscos and the coins have not toned in up to 15 years UNLESS the plastic slides are not fully covering the coins then they tone where the air can get to them. They only tone on the exposed part whereas the rest of the coin stays untoned.