I don't recommend acetone on early copper, especially corroded early copper, unless you plan to treat the coin afterwards. A lot of times, there is a film of oil, gunk, and debris that is actually protecting the surface of the copper from further degradation. When you strip away all of those layers, you leave the raw metal exposed to the environment, and unprotected. If I have a piece of early copper that needs acetone as a solvent, I insist on giving it a Verdi-Care bath afterwards, and then letting it air dry for 24 hours without touching it otherwise. Afterwards, any excess can be (carefully) blotted off and the coin will then be conserved against future damage if stored properly.
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