just noticed something really weird...the image is positive! It hard to see the image within the emulsion but it is undoubtedly posistive. All the film information down the edges is also positive...clear on the neg (but largely obscured by the semi opaque base). I just devd a roll from the same camera from the same shoot in the same chems in the same way (APX400 this time) and it is 100% fine. This is one for the photographic X files!