Because the acid in it is reacting with the copper. When PVC residue is first deposited on a coin it is a clear, oily like substance. But in time...
And that is what I was talking about as not being water soluble - the film it leaves behind on the coin.
One thing I might add Tom, there are those who consider dipping to be nothing than an acceptable form of cleaning, myself included. That said,...
Green on copper can still just be PVC residue Thad, that's about the only exception I know of. And if you just leave verdigris alone, eventually...
It may be verdigris on all of them, but in any case I would say the one on the left is the worst. But all 3 coins are definitely damaged, and...
OK, but you need to realize they are trying to give you the best advice they can. As for your question, I don't know, I think it's kind of iffy...
As you say, Thad can confirm or deny, but I don't think distilled water is going to rinse it off because I don't think it's water soluble.
Only because it is Thad, only because it is ;)
All I can do is tell you what the dictionaries say Sam. That definition is verbatim from a dictionary. If you don't want to agree with the...
This is a good example of part of the problem I had with the idea of the TPGs slabbing problem coins ever since it was first proposed, and why I...
Hesitant to say this, and I won't say too much, but the trick to dipping copper (using conventional dips) depends on two things, well 3 actually....
Hmmm, I don't think anybody else knows it either.
No, they don't. There are quite a few coins, in various denominations and dated prior to 1973, that have been graded as PF70. You're partially...
There is something you need to understand. Verdigris and PVC residue are two entirely different things and are caused by completely different...
If stored in a true vacuum, it's absolutely possible to preserve silver. But since we don't have any .......... Well, that depends on the time...
Are they ? One of the accepted definitions of conservation - con·ser·va·tion [kon-ser-vey-shuh[IMG][IMG]n] 5. the restoration and...
Apparently what you don't realize Doug is that all of the conservation services dip your coins. That's the only thing they can do. They mix,...
First of all, post a picture of the coin so that we can offer opinions on a possible course of action. Secondly, you say you don't want a...
It's a situation similar to what happens when you send a coin in to have dirt/grime and or ugly toning removed. Once the coin undergoes the...
But that's my point Mike, the toning is there in the original pictures. Did it come back worse than it was ? Yes, it became even more visible. But...
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