I am sorry Bobby, the OP never post a photo about another Dime him posted on E-Bay. So what you post photos I answer and for OP if I do not see the new find Dime I can not say something. I do not check what forum members post on different sites. Why I will do?
You post those photos of coins on which the cooper shrink and I wrote:
Quote: Is not acid on 100% and I will made more tests and studies on this kind of anomaly. For me from the point of view molecular it is interesting that the Cu free anions after strike in some conditions migrate to some solute or elements. I will involve also others scientific guys to find exact. But I think it is the point 1.
Do not worry the study will be done to know why this effect happened and in what conditions. Do not expect such study will be done in a day or one week. I have a few example of glad coins and I ask also cents before 1982. I will put also on the DSX to see what we find and analyze.
So me I answer to the OP. To you I do not have yet the answer. The folks always say acid, so till the study will be finish take acid. As per I wrote now I have 3 Scientifics who will collaborate: me in Canada and them in US east and west cost. So 4 different mind with different approaches and test will give you the clock answer.
Ones the study is complete I will send to Mike.
Never argue with an idiot. First they will drag you down to their level. Then, they will beat you with experience. (MARK TWAIN)
The visible "cloud" is water vapour, as the water is heated and aerosolised by the bubbling hydrogen. But it's the hydrogen that's potentially dangerous - it's not toxic, but flammable if exposed to an ignition source.
Note that for copper versus acid, it doesn't really need to be a strong acid to produce this reaction (and create the acid-eaten coin seen here). Vinegar, lemon juice or coca-cola will all do much the same thing - it just takes slightly longer time.
Yes, both the cupronickel alloy and the pure copper will react with the acid - but the copper reacts faster, creating the acid-eaten-core effect.
Don't say "infinitely" when you mean "very"; otherwise, you'll have no word left when you want to talk about something really infinite. - C. S. Lewis
Quote: Note that for copper versus acid, it doesn't really need to be a strong acid to produce this reaction (and create the acid-eaten coin seen here). Vinegar, lemon juice or coca-cola will all do much the same thing - it just takes slightly longer time.
Exactly what I've been telling Silviosi and he keeps referencing studies that he says prove me wrong. I don't even bother to read them because I know either they are wrong or he's interpreting them wrong. I too have pulled these copper-eaten coins out of car cupholders. This is coin collecting 101 for even fairly novice collectors.