I did an automated overlay of a 2014 Roosevelt clash showing on both sides. Take a look here: http://www.macrocoins.com/overlays.html
I've heard multiple accounts of it indeed working. The rice does a similar thing to the commercial dessicants, though it has a limited capacity to...
Yes, water can be sealed, but not with plastic no matter what PCGS tells you. It takes a "glass" material to make a hermetic seal. Perhaps...
My questions were actually rhetorical in nature. It's impossible to seal off air or moisture using plastic materials. They are permeable to both...
How can the slabs be water-tight, but not air-tight? And what does it mean to be "sealed"?
Slabs are not airtight. Does not look like oxidation, but maybe residue of some kind like glue. Looks conserve-able to me.
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Amount from 10 vs 2 depends on the coin. Usually you want more light hitting the face, so if the bust is facing left, 10 should be a bit brighter....
My experience with various stereoscopes is that "modified" ringlighting is the best approach. You'll need a ringlight adapter for the scope, or...
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