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

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.

In article ,
"Graham Fountain" wrote:

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.

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.
--
LF Website @ http://members.verizon.net/~gregoryblank

"To announce that there must be no criticism of the President,
or that we are to stand by the President, right or wrong,
is not only unpatriotic and servile, but is morally treasonable
to the American public."--Theodore Roosevelt, May 7, 1918

"Graham Fountain" wrote in message
...
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.

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

"Graham Fountain" wrote in message
...
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.

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

"Graham Fountain" wrote in message ...
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.

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