I once had a T212 that looked like it had been intentionally saturated with oil which had gotten quite dark over the ages I guess. I asked around with some conservators and one recommended a product called "Bestine"; said it would remove some of the oily residue but not all. I used it on the card and removed a great deal of the oil. Turned the card from trash to something that was suitable as a filler. It did not affect the printing at all but did leave the white of the card grayish. Now, given that the card was entirely a dark brown stain before, it was a great improvement, but I'd not do it on a nicer card without testing first.
Last edited by Exhibitman; 03-02-2011 at 03:30 PM.
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