And if the paper turns out to be fogged, it's PRECIOUS for Lumen prints (sunlight photograms without developer, only fixer). See www.alternativephotography.com). I have a whole stack I inherited, and I've gotten wonderful colors on the fogged paper lumen prints.
YES! I look for old paper at photo shows, etc. just for this reason. See the Lumen print section on my web site for the great results.
Moma don't take my Kodachrome away!
Oops, Kodak just did!