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<p>[QUOTE=&quot;desertgem, post: 620299, member: 15199&quot;]Put some salt crystals into an air-tite, or any holder, and then submerge the holder under water. Hold down with weight if necessary, and check at time intervals. If no water gets in, then the salt crystals will stay sharp edged. As they absorb moisture, the crystals edges will soften. True, we don&#039;t store our coins this way, but it is a typical lab type of experiment to try predictic results based on more extreme concentrations over a shorter time period. </p><p>Again , based on my experiment and not to say that air-tites are not good holders.</p><p><br /></p><p>Jim[/QUOTE]</p><p><br /></p>

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