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<p>[QUOTE=&quot;desertgem, post: 1888120, member: 15199&quot;]Most compounds of nickel are green or green-blue. It could be&nbsp; chloride, oxide, carbonates, etc. and are commonly hydrates. Moisture got into the tube and stayed there for a while is my guess . Most are not water soluble, but in a lab are generally dissolved by acids or alkali, depending on the compounds. Quite possible the commercial Nic-a-Date might work, but never tried it. I would suspect the coin would be altered surfaced.[/QUOTE]</p><p><br /></p>

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