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<p>[QUOTE=&quot;desertgem, post: 24964094, member: 15199&quot;]You can search on&nbsp; Google :&nbsp; </p><p><br /></p><p>&quot;Nickel belongs to the iron-cobalt group of metals. It forms an adherent oxide film that provides its corrosion resistance up to temperatures around 600°C. <b>It&#039;s highly resistant to alkalis and most acids</b>, however, it is attacked by oxidizing acids like nitric and by salt solutions containing oxidizing species&quot;.</p><p><br /></p><p>So If you have the chemicals and a safe lab, it can do things. About 40 years ago, I experimented on using chemicals ( dangerous so not mentioned) to etch away some of the surface of a US nickel to see a date too worn to identify. It worked, but I had taught chemistry already for many years. There are some clips on You-tube, but again only try it if you understand it and have safety equipment and safe way to dispose used chemicals. Your skin is worth much more than any coin.</p><p>Jim[/QUOTE]</p><p><br /></p>

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