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<p>[QUOTE=&quot;Collect89, post: 1781430, member: 15445&quot;]<span style="color: #141414"><font face="Georgia">FYI-</font></span></p><p><br /></p><p><span style="color: #141414"><font face="Georgia">When storing Nickel metal substrates (with patterns on them) for uber-long periods of time, the patterned surface is sometimes passivated and then plated with a sacrificial thin Nickel layer.&nbsp; The thin plating layer protects the pattern on the substrate from any further oxidation/damage.&nbsp; In a few thousand years, the plated layer can be pealed-off exposing the original shiny Nickel substrate with the pattern perfectly preserved.</font></span></p><p><br /></p><p><span style="color: #141414"><font face="Georgia">Of course if you ever tried this with a coin, you would need to remove the plating every time you want to view the coin underneath.&nbsp; </font></span>[/QUOTE]</p><p><br /></p>

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