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<p>[QUOTE=&quot;Conder101, post: 80395, member: 66&quot;]Slabs can&#039;t be made truly airtight becaus the plastic itself is porous enough that eventually contaminant gasses will difuse right THROUGH the plastic of the slab.</p><p><br /></p><p>The reason why the silver DCAM&#039;s&nbsp; seem to have more contrast than the clads is due to the reflective qualities of silver.&nbsp; Silver reflects over 95% of the light that falls on it, if you have a clad and a 40% silver DCAM coin with the exact same amount of contrast, the silver coin will scatter and reflect more of the light falling on the devices than the clad one will making the devices lighter, whiter, and apparently with more contrast to the fields.[/QUOTE]</p><p><br /></p>

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