In case many do not realize , almost all of the chemicals mentioned are not 100% solutions, they are somewhat diluted already and most I have used can be dilute even more although the time is extended accordingly for the same result. MS-70 is ( as mentioned before) is a rather strong acid, but it is water based and may be used for lesser activity for longer time so a person can stop when ready.
How long do I need to leave a coin in acetone to ruin its surface, you seem to know. Just in case you don't reply with a length of time and before I write BS, I'm going to put a proof nickel in low grade "Beauty Store" acetone I use for junk on Tuesday. That way I can confirm your belief to everyone reading your comments.
What's your problem, you don't have to be so argumentative and arrogant with everyone. I've seen you treat other people on this forum with the same disrespect. If the OP wants to "soak" his coins then so be it. Personally I wouldn't.
Define modern please. I'm talking about silver. I don't collect junk clad as a rule. If I see something not silver and nice enough that I don't need to "restore", I'll buy it or yank it out of my pocket change.
I was looking for opinions of experienced collectors here. Nothing is gonna hurt my feelings. Just as a sidebar, I watched a couple of videos who put their money where their mouth was. One collector broke out mint state sets and tested "restoring" with acetone, MS70, and EZest. He dipped all 3 sets and randomly mixed them into other coins but kept records of which was what. He was cleaning off milk spots on near perfect coins. Every one of them came back straight graded and none with "details". So there's that. I'm looking for those who have experienced otherwise.
Yeah, that poor horse has probably been beaten more times than any other horse ! And there are countless numbers of threads and posts on the subject here on this forum which you can read. As for experts v random commenters, determining which is which can be tough to do at times. I say this because while most of what the experts say is true, there can be and are exceptions to some things. Not much in this world is 100% true all of the time. And while some of what random commenters say is also true, some, and sometimes a great deal, of what they say is false. Take the 3 things you mentioned, acetone, MS-70, and e-Z-est. When used properly all 3 can safely be used on coins, but even when used properly there can be and are are exceptions for all 3 as well. The key is knowing what those exceptions are and being able to identify in advance when and when not to use them. Explaining all of this, along with everything else that can be used, and all of their exceptions, would take an entire book's worth of information. That said, and leaving out all of the exceptions for everything, in simplest terms - proper cleaning = good. Improper cleaning = bad. The last part of that comment is bit worrisome to me for it seems to imply that you want to do things, clean coins, yourself. But given all your comments in the rest of this thread my advice to you would be one word - don't ! I say that because it is all too easy to turn proper cleaning into improper cleaning when one does not have the experience and or not know what one is doing. But perhaps I am misreading, misunderstanding. Perhaps you are considering sending coins to others to have them properly cleaned. If that is the case you'll probably be all right. For there are plenty of folks who do know how to properly clean a coin, they are professionals and do it for a living. One of them is a responder in this thread, and he has been doing it for a living for decades. He is also and has been a professional coin grader for decades And before you ask I am talking about Insider. And that said, there is also something else you should be aware of. And that is that even when done by the most experienced and knowledgeable professional coin cleaner there is, and even when things are done properly, cleaning a coin can turn out to be bad in the end. That is because even proper cleaning of a coin can reveal bad things, conditions, on the coin that could not be seen until after the coin was cleaned. In other words, what was cleaned off the coin was hiding these things. And revealing them can prevent a coin from being cleanly graded, and greatly reduce the previously perceived value of the coin. Of course the opposite can happen as well. In a great many cases proper cleaning results in the value of of a coin being greatly increased. Sometimes by as much as 200 or 300%. So there can be, may be, good and bad to both sides. But I'll repeat, as a general rule, and in simplest terms - proper cleaning = good improper cleaning = bad. And before anyone else also asks, proper cleaning is defined as a method that does no harm to the coin. Improper cleaning is defined as a method that does do harm to the coin. So now, you're pretty much where you started. And that poor horse is still being beat upon !
Over time coins may get haze, unattractive toning in the holder and need a dip / conservation. Heat, humidity, salt air major culprits. Quick turnover is recommended so to avoid that scenario. Conservation from a TPG can help.
Let me set you and anyone else on this form straight for about the fourth time! I am a very old man who does not tolerate some "opinions" from anyone. I learned long ago to be like someone from the "SHOW ME" state. There is so much nonsense spread around on the Internet forums (like what you posted) that it needs to be smacked down so others don't "parrot" it. Example: Back when I joined the ANA, they considered whizzed coins as cleaned! I am an equal opportunity curmudgeon. I grew up in the sticks-and-stones generation and what we said to others would cause tears today. Writing BS is cold. However, I don't choose to write several sentences to say the same thing so that I don't offend anyone here. Time is money and when I have to reply to posts as yours it makes me sick to even be on a chat forum. Now, I'll address your notion of arrogance and a know-it-all attitude. I am the least arrogant person you will never know. I know my limits and trust me when I tell you I'm just one of the middle-sized fish in our hobby. I learn something from others just about every day. Example, I've been working with a coin doctor for several weeks learning his methods so that I'll be able to catch more coins with altered surfaces. It is scary. Just because he is very good at what he does, I don't consider him or anyone else who knows more than me to be arrogant. That's because if you point to center field wall and say that's where the home run will be and then do it with a big grin, it is not arrogant. Now, you posted that acetone etches metal. Have you confirmed that personally or are you just one of the internet parrots? In my arrogance, I'm going to see if that is correct or BS. PS My comments have nothing to do with the OP soaking coins. Your opinions are my target. Soaking coins is one of the "tricks" of conservation. The OP is on the right track.
I 100% agree. It's the old, if a tree fell in the forest, and no one saw or heard it, did it really fall? I also 100% believe if harming a coin in anyway, shape or form is involved, don't do it. I don't understand some of the attitudes that some unholy rite was performed when it doesn't alter the original surface metal in a coin. Damage by abrasive means, dings and bag marks can't be undone, that horse already left the barn.
I think its time to realize that we should realize we all live in a shared environment that differs tremendously. Some are high humidity almost always, others are desert dry , almost always.Some are close to oceans and large lakes, etc. etc. Some live near chemical industries and have high levels of reactive chemicals in their homes, environment, and coin chest woods. If you want to see an "End Effect", put a handful of pocket change into your car drink holder and add at different time a "Soft drink" and then 2 months later a cup of " pure water". I "unthinking" had such occur with me. Those coins could NEVER be "cleaned" /"Restored" back to original. However, we haven't said much about copper/brass coins being "cured". My favorite chemical is "Verdi-Gone" for such. Jim