I assume one rationale for the distinction is that water is not generally believed to adversely affect the integrity of the underlying card whereas chemical solvents (using the term in its common sense) generally are believed to do so. But it's probably hard to articulate a distinction that one couldn't find some fault with.
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Four phrases I nave coined that sum up today's hobby:
No consequences.
Stuff trumps all.
The flip is the commoodity.
Animal Farm grading.
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