A wet sheet transfer is just that. When the stuff is printed the sheets would have been set aside to dry, if they were pilled on before they dried you could get a wet sheet transder ie, the ink wasn't dry on the back of the top sheet and transfered to the front of the other sheet.
You generally don't see a mix of backs though, ie generally you would see a EPDG back with a EPDG transfer on the front.
I have talked with SGC about this and they will not mark them any differently much like they won't mark Ghost images either.
James G
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