"The frame edge of the negatives is still sharp. The whole film, including the lead-in edges, and area outside the actual exposed area (where the socket holes are), is a dark sort of creamy brown colour with what looks like a fine grain of sand over everything when you look at it through a lupe."(posted 8785 days ago)Here lies the clues... but, alas, I do not know the answer! Someone will! All traditional B&W films that I have used (including Ilford FP4, HP5, PanF and the Delta's - which I guess is the one you using by saying you use 100 speed film outdoors) have a grey film base (in varying degrees) Sounds like some sort of contamination in your chemicals... Did the developer and fixer mix up clear? The area around the sprocket holes is un-exposed. Are the frame numbers readable?