Perfect example is the proof and ms Jefferson westward nickel series. From the US mint all of mine are no longer silver but turned gold toned. Another are the 1994 and 1997 Jeffersons special matte nickels finished show me 1 that's not toned again gold tone.
I use a credit card to place coins in the slots, then the tip of a ball point pen to insert them...never a problem in years of collecting.
So, what are us mere commoners (novices) supposed to use if not Dansco. What about Whitmans? This gets somewhat confusing because years ago this group said "don't use Whitmans" for similar reasons. It would seem that for as long a most of you have been collecting, there would be a definitive answer to this question.
It a personal choice....some love Dansco albums, some don't, over 50 years of collecting I started using Whitman albums purchased at a Reads drug store! Since then Ive tried severl way to display or store my collection. Google Kointains.....I still have a complete Jefferson collection both MS, and proofs in a Kointain sliped in a mylar 2x2 flip and taged with the white incert. Some had issues with Kointains....truth be told they were developed for museums to store as well display coins. The longer you collect the more you need to store, and it comes to a point where you have so many different slabs, raw coins, 2x2's etc etc.... that the biggest problem is where to keep all this stuff.....
I have only a few proofs in my Dansco 77, but I store my proof sets from 1950 thru 1989 in Whitman snap lock set holders. Never a problem after years of storage...always used the credit card method for handling the coins...no gloves, no nothing ever touched the coins. All are pristine as original.
this is exactly the cause. the original packaging. it has been known for quite a while. it is not from a finger pressing a coin, with or without a glove.
Again the 1994 and 1997 matte Jefferson nickele only found in special sets mintage like 67,000 and 25,000 both date came in a card with plastic cover, the two comm's that came in the sets also toned... and both sets has bills in the set. Mixing all the inks, and glues plastics they toned if you wanted then to or not.
Environment plays a role (some are more conducive to toning while others will not cause much or any toning). And if you removed them early enough from the packaging, that could have helped prevent the toning.
I live in the Arizona Desert which is mostly dry and clear air ...I think this is a desirable environment for proof coins as compared to other moister climates, or urban settings, although, Mint packaging is the most destructive enemy for proofs in my opinion.
Anything a Dansco album can do, you can do with Air-Tite pages and a 3-ring binder. It won't look quite the same, but what difference does that make?
That is some unfortunate bullseye toning. I’m sure these looked fine when you put them in the Dansco, but it makes me wonder if someone else perhaps at the Mint mishandled them and the Dansco provided the right environment to bring the toning out over time. My presidential dollars are in a Dansco and they are toning reddish gold and look pretty good. TC