Most grading is done by eye or with minimal magnification; in any event, no greater than 5x.
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I will give the acetone a try. I'm assuming just a soak and not a rub. Please advise. It would be appreciated.
I'll give you the basic intro; search the word elsewhere in the forum as it's been discussed extensively. I would warn you: Although acetone is chemically inert to your coin and its' use cannot be detected by any method, there are those who would stand against its' use.
First. Acetone is incendiary and hugely volatile and will cheerfully burn your house down if you give it the slightest chance. Use it only in a well-ventilated area.This is a soak, not a rub. *Nothing* acceptable in the treatment of any coin is a "rub." Ever. Use a jigger glass or something of that size; I've been known to use a juice glass with a shotglass inside it, so the coin does not rest flat which would tend to interfere with the process.
Set the coin in the empty glass first, so you can set it without dropping it, and then pour the acetone in. Use "rubber" tongs (actually a chemically inert material when bought as "coin tongs") if you have them. Me, I cover my work with a pane of glass to keep fumes out of the house and stop evaporation. Give it two hours, grab the coin by the edges, swish it a bit and then start a new soak with fresh acetone. Let this one sit overnight. If there isn't a visible difference in the coating after that, acetone won't help. There have been a couple occasions in my experience where the first soak didn't make a difference, but the overnight did.