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Message:: [QUOTE="aubade21, post: 1965233, member: 44104"]There are degrees corrosion. As you say, it's a natural process that largely depends on factors such as atmosphere and location. Some heavily corroded coins spent some time in the ground, others had hard lives battling the elements and chemicals from normal circulation. So in most occasions, corrosion is completely natural. Cleaning, however, is not natural but rather intentional alteration. Both, cleaning and corrosion, of course, will generally wind up in "details" holders, but eye appeal varies largely between coins. Some cleaned were dipped, others were scratched up with a brush, leaving hairlines all over the coins. Some corrosion is mild and only at the microscopic level, where other coins have the surface of an eggo waffle. I my experience, more people are forgiving of cleaned coins that were dipped. I think the idea behind that is there is a chance that the coin will eventually retone over time and get to an acceptable color. There is no going back on corrosion, unfortunately. However, I've seen many coins with porous surfaces, still have sharp, pleasing features, and I would have no problem adding those to my collection.[/QUOTE]