Greg- of course I don't know for sure chemicals were used, but on many occasions I've sent paper ephemera to my conservator to clean, and to remove a stain of that nature, he's always had to use a chemical of some kind. I just don't know how you would remove the stains on that Plank without some form of solution. That is not easy to get out.
Last edited by barrysloate; 02-03-2011 at 03:24 PM.
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