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When you use thinned oil based
paints on untreated paper, you can get grease stains that never disappear.
Printing inks are formulated to be used on ungessoed heavy paper, but oil
paints with lots of linseed oil are not. I believe Betty recommended easy
wipe compound which is made by Graphic Chemical (a printmaking supply
company). This can be used with printmaking inks to change their
consistency, making them easier to wipe when doing subtractive monotypes.
Deb Rosenbaum