Reply to Thread

Message:: [QUOTE="Kirkuleez, post: 2385051, member: 36864"]You may not know this about me, but I am a chemical engineer who develops high pressure systems for the petrochemical industry that are deployed all over the word in some of the harshest environments on the planet. Much of my job is calculating and studying the rate of corrosion of materials when exposed to certain chemicals/environments. I have written papers on the subject that have been published and some of the worlds largest companies come to me for advice. I know what corrosion is, how to speed it up and how to prevent it perhaps better than anyone on this forum. When I say that the spot isn't corrosion, you can take that to the bank. I'll try to get a better image for you when I get home, but I would have thought that you would be familiar with die chips and the fact that they are raised off of the surface of the coin. Edited to add images though I don't think that they will help very much. I warned you that my photography skills sucked. All I have is my phone and a single lamp. The detail I tried to take through a loupe, but it sucks too.  The color here is much more like the coin in hand, but the dark areas are actually blue and violet in natural light. I suspect that this coin was cleaned then stored away in a sulphur laden atmosphere. [ATTACH=full]489304[/ATTACH][ATTACH=full]489305[/ATTACH][ATTACH=full]489309[/ATTACH][ATTACH=full]489310[/ATTACH][/QUOTE]