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<p>[QUOTE=&quot;Theodosius, post: 3980646, member: 77077&quot;]Lemon juice and aluminum is safe on high purity silver coins but will totally strip bronze to bare metal and then start eating the metal.&nbsp; I have tried it on crusty bronze slugs.</p><p><br /></p><p>The issue with your coin is how sound is the underlying metal? It could be porous and fragile. I agree with the advice to not use any liquids but restrict yourself to plastic and wooden picks unless you really know how to do it.</p><p><br /></p><p>I have cleaned 100s of bronze and silver coins and I can tell you most of what you read on the internet is 100 years out of date (using olive oil) or otherwise wrong. Before ordering any chemicals and having a go I suggest reading their material safety data sheets. Some of the chemicals the old time sources and modern internet posters suggest are highly toxic with long lasting effects: such as benzotriazole. Be careful...</p><p><br /></p><p>John[/QUOTE]</p><p><br /></p>

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