Response to fine lines of light density on negs

Thanks for the responses to date. I will answer one or two of the questions raised. The films I most noticed the problem in were a roll of Delta 100, where the mark was right through from frame 1 to 36. The other was a roll of FP4 where it started about half way through the roll and was in a more midway position on the roll. The tank I use is a standard Patteson one and I did have a few totally unaffected films in between. The camera in both cases was a Nikon F3. I have thoroughly checked the camera. It was in need of a clean inside but was by no means that bad. There is a very slight rough patch in the camera between the film guides and this would probably have been caused by the film leader during countless rewinds. The emulsion surface shouldn't be in contact with this area and this would not correspond with the position of the line on one of the films anyway as it was too high. I had not considered static. Thanks again.

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