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Message:: [QUOTE="GDJMSP, post: 3530096, member: 112"]With the key phrase being "for sure" - no they cannot, and neither can anybody else. Yes both are forms of corrosion. But there are many different looks that natural corrosion can have, and with experience one can make an educated guess as to whether or not that corrosion has a natural look to it, or whether it has an artificial look to it. One also has to understand that there are ways, methods, by which coins can be artificially toned that makes them 100% indistinguishable from naturally toned coins. AND - that there are ways, methods, of artificial toning that do not work. Ways that have a certain look to them that make it very likely that the coin is AT.  But in the end that's all it is, an educated guess - but one based on experience. Yes it could be, and in most cases probably should be. However one must always remember that completely natural toning can occur very, very quickly. Under the right conditions a few months is all it takes. Conditions are what dictate toning - not time. Again, this is where experience comes into play. Natural toning occurs in more ways than we count, and it has great many different looks, a great many ! Some of them are similar to others, some of them are quite different, unusual, one could even say rare looks in a few cases. But some forms of artificial toning all have very similar looks, and are usually easily identified, and liquid chemical toning is one of those. So, for whatever it is worth, my opinion is the coin in question is AT, and poorly done at that. I think it was done using chemicals in liquid form and that method is seldom successful.[/QUOTE]

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