Interesting, one of my dealers handed me a box of 4 X5 Azo dated 1964. I smiled and thank him. When I got to the darkroom i opened the box and took a piece out and ran developed, stopped , fixed, etc. The top few sheets and the bottom had strange things going on. THe wrapping paper was very musky which probably was the reason for the staining as the middle section was white. I expected some sort of fog and was really amazed that I got White paper. It will be fun to play with; and i was thinking about using LPD or perhaps Ansco 130 and then split tone . (or attempt to split, I have been told it will split.)