Bytheway, I have purchased today a bottel of pure parafin oil for the experiment on copper coins as we discussed (hope that you still remember). I will conduct the experiment this week end, any tips would be appreciated.
Amr, Great--I would experiment first on a common coin and see the results. I would try soaking first for a day and see if the copper changes color (it shouldn't). With mineral oil, I've found some dirt will lift of copper coins without any effort. Good luck!
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