In Glenn's terms I guess the way I had been thinking of it was that if just water could get a stain off, then the stain really hadn't interacted with the paper so much as it was just sitting on top of it, and that if it had interacted you would need a chemical to undo it, but the recent discussions suggest that may be too simplistic or just flat out stupid and wrong.
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My avatar is a sketch by my son who is an art school graduate. Some of his sketches and paintings are at
https://www.jamesspaethartwork.com/
He is available to do custom drawings in graphite, charcoal and other media. He also sells some of his works as note cards/greeting cards on Etsy under JamesSpaethArt.
Last edited by Peter_Spaeth; 07-09-2015 at 12:16 PM.
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