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Message:: [QUOTE="BadThad, post: 832708, member: 17261"]No problem Doug. All mineral oils, regardless of the purification level, will contain trace elements such as sulfur, phosphorus, chlorine, etc. All of these elements are very reactive with metals. Over time, they will react with the surface and ultimately cause toning, discoloration and even pitting. The reaction rate may be very slow, but it's not a matter of "if", it's a matter of "when". It is going to happen. I highly recommend that collectors soak any suspect oiled coin in xylene to remove the oil. It should then be rinsed with acetone and stored in an air-tight environment. It should be noted that acetone will not dissolve oil. Xylene is by far the best choice for the removal of oil. Toluene will also work well, but I find the odor offensive.[/QUOTE]