The other night at Moonalice’s 420 event, a TRPS member suggested we do more programming about paper-conservation techniques. Coincidentally, I just came across this video produced by the National Postal Museum at the Smithsonian. It’s actually one of several videos and pages at the National Postal Museum devoted to Preservation. Let us know if you find it helpful!
It was not clear whether the document was suspended above the water or in the water.
Yes, it’s clearly stated that it is suspended above the water.