Storage/Organization Question: Coins in original government packaging.

While I can't say it with certainty, the nickel you posted a pic of appears to have already been permanently damaged by the toning - meaning the toning/corrosion has eaten into the surface of the coin. You could use coin dip and remove the black but what you'll see when you do is a pitted and corroded surface - permanently damaged in other words. And no, there is nothing that can be done to fix it.

The thing is, experience is an absolute must when using coin dip. So don't ever try unless you know what you're doing. And using coin dip is always a crap shoot because you never know what you're gonna see once you remove what you're trying to get off the coin. In other words, irreparable damage may have already been done. But, you don't know that until you do it. And if done correctly, proper dipping can make a coin beautiful again. And sometimes, significantly increase the value of the coin.

As for opening the cases, that's been explained by others already.

 

No, acetone won't do anything for those coins. It's true it won't hurt anything, but in reality it's a waste of time to ever try.

Acetone is great for doing some things but there is a very limited list of things it can do !

Again, there are literally hundreds of posts on this subject. I urge you, and everybody else who has questions, to search for them and read them.

MS70 is great at removing haze from coins, but that's really about all it's good for. And you DO NOT want to use it on copper ! MS70 will turn copper a bluish or purplish color - it is infamous for doing this ! Other coins, fine, but not on copper.

As for E-Z-Est - you absolutely MUST know what you are doing to use this ! If you do not, it is extremely easy to permanently damage the coins ! So either have somebody teach you, in person, how to use it properly, or learn yourself the hard way and it takes some doing that way, but it can be done. But don't try it on any coin you care about - until you do know what you're doing.

Not a good idea for the reason I stated above.

 

Well, I think I know what ya mean, but using MS70 is, by definition, cleaning. But it is proper cleaning when done correctly.

Please practice on some coins you don't care about first. And, always make sure you rinse thoroughly in distilled water, and then properly dry, all coins you use it on.