Unless it was found in the ground, mineral oil is probably not something you want to use because it will not do the job. Mineral oil can be used for crusty coins but if they are just plain dirty, you can use easier and less time consuming methods. It is frequently used on crusty ancients and a long soak will loosen the encrustations that comes with laying in the ground for 2000 or so years. Mineral oil will work over a period of months, not days or weeks, for the crusty stuff.



















