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<p>[QUOTE=&quot;cladking, post: 1308412, member: 68&quot;]Olive oil works only on copper and bronze (tin)(maybe aluminum).&nbsp; It only helps to remove encrustations.&nbsp; I use a locust thorn or tooth pick to gently pry things off to minimize soak times. You never really know what&#039;s under the encrustration and it could be a very serious flaw such as a hole or corrosion.&nbsp; But you can develop an eye that will give you abn idea.&nbsp; Often the coin is so ugly that you might as well try it.&nbsp; Sometimes a really beautiful coin is hidden under it and sometimes a dog.&nbsp; </p><p><br /></p><p>Don&#039;t clean nice collectable coins without any experience.&nbsp; Valuable coins should be sent in for professional cleaning even if you know how probably.&nbsp; Very old coins are almost always cleaned or they need it.&nbsp; </p><p><br /></p><p>I figure many coins look a lot better after you thumb a little oil into them so a small amount of olive oil that has penetrated the metal might not hurt.[/QUOTE]</p><p><br /></p>

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