Posted By:
Max WederAs Greg has done, I have engaged paper conservators to restore paper (in my case books, especially dust jackets.) When I sell a restored book, I always make full and complete disclosure of the restoration work that has been done.
Here's an example from the conservators I use, who do restoration work for the Vancouver and Seattle Art galleries (from their website; it is not my document)
http://fsrconservation.com/3con4treat.php#paper2
Before:

After:

Max