I found an old box of Wratten & Wainwright "Wratten M Plates" on EBay the other day for a decent price, so of course I bought them. I really bought these for the box and the glass, but me being me, i got to thinking if these might be any good still. From the looks of the box, they expired in the early 1940s at the latest. Anybody have ideas as far as exposure, development times, are these ortho or pan? Any chance that these are not completely fogged to hell? Surprisingly, the internet has failed me so far at finding any specifics.