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<p>[QUOTE=&quot;troyheights, post: 433872, member: 11271&quot;]First, let me apologize for providing the poor information that cuprous oxide provides a protective barrier.&nbsp; I see that Cu2O can naturally change to cupric oxide (black), copper carbonate (green) and other things too.</p><p><br /></p><p>However, I am curious about its propensity to change in the absence of a catalyst.&nbsp; Having stored my childhood collection of wheats in a Whitman folder for 25 years with no ill effect, I would guess coin encapselation in any of the readily availible inert plastic holders would be more than sufficiant protection for generations.&nbsp; Although if one lives in a harsh enviroment for coins (heavy pollution or moisture) additional protection is needed.&nbsp; Again, this is a personal guess, hopefully someone with broader experience can accurately decribe the real-world danger faced by brown copper coins to unwanted corrosion.</p><p><br /></p><p>Secondly, while ocean air does not contain some terrible mix of free floating sodium and clorine ions, it does contain salt (NaCL).&nbsp; Wave and wind action aerosolize sea water and loft it into the atmosphere.&nbsp; Nothing special happens to change the composition; These tiny droplets contain all the organic and inorganic compounds you would expect to find in the ocean. I dont know if the salt air is expressly bad for coins, but its something I&#039;d rather not find out the hard way.[/QUOTE]</p><p><br /></p>

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