What causes this? - "run" on a negative.

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Graham Fountain - 13 Nov 2004 11:58 GMT

Processed a roll of film tonight - Fuji Neopan SS, in Ilford LC29. Did
everything the same as I normally do - developer at 1+19, 20deg C, 5 min,
single shot, 10sec of agitation every minute - just per the instructions,
and exactly how I do every other roll that I have developed.
Once I finished, I noticed that most of the shots were quite drastically
over-exposed (just got the camera back from repair, appears it isn't fixed).
Anyway, on the over-exposed shots, the negative looks like the silver has
run, sort of like if i was to put ink on blotting paper. It is most
noticeable around the edges of the frame, where the "run" goes for about 2
or 3 millimetres past the edge of the frame. Is this a problem in the
developing process, and if so, what? or simply an artifact of the
over-exposure? I had a closer look at the camera, and it looks like the
meter is now running 3 stops over, so that would roughly be how overexposed
the film is.

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Gregory W Blank - 13 Nov 2004 12:33 GMT

> Processed a roll of film tonight - Fuji Neopan SS, in Ilford LC29. Did
> everything the same as I normally do - developer at 1+19, 20deg C, 5 min,
[quoted text clipped - 10 lines]
> meter is now running 3 stops over, so that would roughly be how overexposed
> the film is.

Sounds like one of two things;

Surge marks from over agitation or sometimes when film is
dramatically overexposed the over exposure "bleeds" somewhat
into the film base where would typically be clear.

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jjs - 13 Nov 2004 16:15 GMT

> Processed a roll of film tonight - Fuji Neopan SS, in Ilford LC29. Did
> everything the same as I normally do - developer at 1+19, 20deg C, 5 min,
[quoted text clipped - 4 lines]
> fixed). Anyway, on the over-exposed shots, the negative looks like the
> silver has run, sort of like if i was to put ink on blotting paper.

You have such drastic overexposures that light is "piping" through the
emulsion so that film is exposed beyond the focused object.

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Uranium Committee - 13 Nov 2004 19:10 GMT

What you see is halation caused by light rebounding off the back of
the film base. This is caused by severe over-exposure.

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