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You did not mention what type of device that you used for close up inspection of the mint mark. Personally we use a 7-40 power microscope. The 1886-S is usually not targeted for alteration. The mint marks on the Morgan series have a lot of issues. Since the mint mark was added to the die upon arrival with the aid of a hand punch, these marks will vary to some degree. Once the die has been polished several times, it also will appear differently. There are better ways to look for altered mint marks without the use of chemicals. If you have access to a high powered loop (10 to 15 power) or microscope, look at the base of the mint mark. You will see the metal flow lines that make up the mark. If you are still concerned about the possibility, have the coin authenticated by a third party grading service.
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