stand developing problem

Discussion in 'B&W: Film, Paper, Chemistry' started by himself, Jan 15, 2013.

  1. himself

    himself Member

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    mornin'

    There has appeared an area darker than the rest, after an hour of development in rodinal 1:100 at 20 degrees, agitated (inversion) for the first 30 seconds then for 10 seconds on the 20/40/50 minute (stopped: 20seconds, fix: 2 minutes), the negative developed well and mostly uniform except this one area about 1cm right along the one edge of the film.

    is this caused by developer sinking to the bottom of the tank, or not enough fixing, stopping, developing?

    I've attached a scan of one frame for everyone to have peak at, some are more prominent than others and on one frame looks like waves (too much agitation)... so I'll stick that one up too.

    thanks in advance

    Ilford (7).jpg Ilford (12).jpg
     
  2. Worker 11811

    Worker 11811 Member

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    I don't know the answer for sure but are you certain that the film was completely submerged in the developer? (i.e. Did you put enough chemistry into the tank?)
     
  3. himself

    himself Member

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    I did, but the reel may be sticking on inversion... still should be submerged tho'
     
  4. juan

    juan Subscriber

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    Are they plastic or stainless reels? What size film? I've had plastic reels with 35mm film try to float or hang up in the tank. It does look like you did not get developer for the full time.
    juan
     
  5. himself

    himself Member

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    plastic reels and 120 film.
    looks like I could do with something to hold the reel at the bottom of the tank.

    **looks like I'm actually missing a part of my tank.
     
    Last edited by a moderator: Jan 15, 2013
  6. Ian C

    Ian C Member

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    If you have excess space above the reel (or reels) you can cut a piece of pvc pipe of the right diameter to fit over the core tube. You want to cut it just long enough to clear the top so that when you close the tank, the pipe will keep the reel on the bottom and leave a little clearance from the top of the pipe to the underside of the tank lid.
     
  7. Worker 11811

    Worker 11811 Member

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    Don't you have a plastic C-clip that goes around the center tube to keep the reel from riding up?

    All of my plastic tanks have them. When I use a single reel, either 120 or 35, it needs to be on there or else the reel has a tendency to ride up. The only time I don't need it is when I have two reels (in a two-reel tank) which fill the entire vertical space.

    Sometimes, if those clips get old, they don't hold tight enough. They either crack or lose their elasticity and, thus, can't grip the center tube.

    If you have clips and you used one, check it to be sure it holds. If you don't have clips, look for some. If you can't find any, I like Ian's idea.

    In fact, I just might do that instead of using clips. I imagine that might work better.
     
  8. himself

    himself Member

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    no I don't have the clip... funny how the strangest things can walk away.

    I'll have to try Ian's ideas, thanks Ian
     
  9. mwdake

    mwdake Member

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    If it is the size of tank that holds more than 1 reel of the given size and you have spare reels you can just add empty reels to the column above the loaded reel. This will stop the reel sliding up the column.
     
  10. Athiril

    Athiril Subscriber

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    I don't think paterson tanks come with C clips.. I 've never gotten one with any.. only with second hand ones at markets.

    Just put another reel above it is another solution.
     
  11. Leighgion

    Leighgion Member

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    My Paterson tank & reels set came with a C-clip, but that was some years ago.

    I'd concur the reels not dropping back down after inversion is likely the problem. I've had it myself when I forgot to put the clip on.
     
  12. himself

    himself Member

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    I made a small "stopper" from half a film pot, so hopefully that'll do the trick.

    thanks everyone