I have recently been experimenting with a group of low grade T206s that had ink stains on the back. I thought I would try a certain very common solvent and see what happened with a $15 card. It worked. Tried three or four more. Black fountain pin ink disappears in minutes. Just dissolves. The card comes out much cleaner, but there might be a little fading. Hard to tell. I'm not selling these cards. Not out to defraud anyone, but I'll bet I'm not the first to figure this out. Very mild common chemical. I did a card with what looked like old typewriter writing. Under magnification you can see the typewriter marks, but the ink vanished. As I say I'm not going to screw anyone, but I'll bet there are others doing it.
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