[Jim Jones]

. . . I don't mean to come across as voting that dry-mounting is bad. Just that it _can_ be bad.

Yes, indeed. Over a dozen of my B&W silver prints dry mounted years ago have a slight yellowing on the mat boards around the edges of the floating photos. Unfortunately, at this late date I don't remember exactly which mounting tissue was used. The rag mount board was from Light Impressions. Oh well, I can recycle the frames and glass. Much worse, a Cole Weston print bought about 32 years ago has the same problem. I now print on oversize paper and hang the prints on the mount board. They don't look as good as dry mounted prints, but can always be dry mounted later.