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Message:: [QUOTE="GDJMSP, post: 3845906, member: 112"]How much attention have you ever paid to rust on iron or steel George ? And/or trying to remove it ? If you have ever paid any attention at all really you should have noticed that as rust progresses some it, often even a lot, become soft, flaky, powdery in nature and it is easily removed. Sometimes even simply blowing on it will cause it to fall away. Then consider this, this is what you described in your post that started this thread - My point here is that when the rust was deposited on the coins, the soft, flaky, powdery bits of it was washed away from that pipe by the water and then deposited on the coins, where it then dried and adhered to the coins. So yeah, it makes perfect sense that using water will then cause some of it to go back into solution and come off the coins. I mean that's how it got there to begin with. But only the loose parts are gonna be carried away by water, the rest will remain. Unless and until it is removed by something that will dissolve it and remove it. The trick is to use something that will not harm the coin while it's doing that. And to be honest with ya, the only thing I'm aware of that will do that is coin dip. At the same I understand your desire and maybe even need to do your own experiments - nothing wrong with that, it's often the best way to learn.[/QUOTE]