Soap and water is not a drastic thing and I often use it. Actually if it is a mild detergent, you can spread it on with your fingers and then rinse liberally with water. I then use a fresh white towel (washed itself in mild soap to tamp the surface of the coin. You might then try the acetone if there is any residual.
Copper is definately a challenge, but the soap and water treatment can pull some things that acetone may not and vice versa. 70% rubbing alcohol is yet a different solvent. I have also experimented with the Blue Ribbon and MS70 with varied results and would hold off the latter two until you try it on some other bits not of value.
If these things don't work you might consider the NCS service - I have an EF 1844 farthing that has some crud that may ultrasound off but will send to them.
Love that Milled British (1830-1960) Well, just Love coins, period.
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<< <i>Soap and water
<< <i>Acetone dip, second acetone dip (in fresh acetone), and two dips and a rinse in distilled water should do it. :
Copper is definately a challenge, but the soap and water treatment can pull some things that acetone may not and vice versa. 70% rubbing alcohol is yet a different solvent. I have also experimented with the Blue Ribbon and MS70 with varied results and would hold off the latter two until you try it on some other bits not of value.
If these things don't work you might consider the NCS service - I have an EF 1844 farthing that has some crud that may ultrasound off but will send to them.
Well, just Love coins, period.