Negative curl

Discussion in 'B&W: Film, Paper, Chemistry' started by RPippin, Jan 7, 2009.

  1. RPippin

    RPippin Subscriber

    Messages:
    286
    Joined:
    Apr 28, 2008
    Location:
    Staunton VA
    Shooter:
    Multi Format
    I'm a bit new to developing my own film and have a couple of questions. I've made sure the temps and timing were correct, but my negatives seem to have a bit to much curl to them. Once they are cut and put in covers I can put something heavy on them and they will flatten out a bit. I don't have a glass negative holder for my enlarger for 6X6 and need them to be as flat as possible. Any suggestions? Thanks in advance.
     
  2. Jon Shiu

    Jon Shiu Subscriber

    Messages:
    2,822
    Joined:
    Dec 2, 2003
    Location:
    Elk, Califor
    Shooter:
    Plastic Cameras
    Hello, what enlarger do you have? It would be best to get a glass negative holder. Also, for some negative holders, you can get a piece of Anti-Newton Ring glass, such as from a Gepe 6x7 slide mount, smooth the edges with sandpaper, and fasten the glass to the upper part of the negative carrier, inside to flatten the negative. Another idea is to make your own negative carrier out of two pieces of glass, hinged with tape. Watch out for Newton rings, though.

    Jon
     
  3. bobwysiwyg

    bobwysiwyg Subscriber

    Messages:
    1,620
    Joined:
    Mar 28, 2008
    Location:
    Ann Arbor, M
    Shooter:
    Multi Format
    Can someone explain Newton Rings to me, what causes them, what prevents them?
     
  4. trexx

    trexx Member

    Messages:
    299
    Joined:
    Nov 16, 2004
    Location:
    Tucson
    Shooter:
    4x5 Format
  5. archphoto

    archphoto Member

    Messages:
    1,066
    Joined:
    Dec 14, 2008
    Location:
    Holland and
    Shooter:
    4x5 Format
    The problem starts with drying the film after dev and fix: I use a cloth-line, bend paperclips to hang 35 and wooden clothpegs for 120 and weigh the films down at the bottom end. At least the neg's dry without a curl.
     
  6. Konical

    Konical Subscriber

    Messages:
    1,709
    Joined:
    Jun 1, 2003
    Good Afternoon,

    The usual solutions are weighting the film as it dries, reverse winding it for a day or two, and putting it under something flat and heavy if it's already cut into segments. Curled film usually presents more problems in contacting than in enlarging where a good negative carrier will often do the trick. A fairly recent APUG thread on this topic has numerous entries; I suggest a Forum Search.

    Konical
     
  7. Klopstock

    Klopstock Member

    Messages:
    68
    Joined:
    Jul 12, 2008
    Location:
    Kiel, German
    Shooter:
    35mm RF
    If you used polyester based films, choose a normal film on acetate base next time :smile:

    During winter, in heated building causes very dry air. The gelatin shrinks and curls as it 'exhausts' water. Maybe a simple air humidifier will help. Quite simple: put a wet towel on the radiator (unless it is an electrical heater).
     
  8. bobwysiwyg

    bobwysiwyg Subscriber

    Messages:
    1,620
    Joined:
    Mar 28, 2008
    Location:
    Ann Arbor, M
    Shooter:
    Multi Format
    Thanks for the link, very understandable though I don't think I will commit the formula to memory.:wink:
     
  9. ntenny

    ntenny Member

    Messages:
    2,282
    Joined:
    Mar 5, 2008
    Location:
    San Diego, C
    Shooter:
    Multi Format
    You say that as if all films were equal. :smile: Curly polyester is a pain in the donkey, to be sure, but you're gonna have to pry my CHS 25 from my cold dead fingers anyway.

    Actually, I've lately been experiencing really annoying longitudinal curl with (the 35mm version of) that normal-est of normal films, Tri-X. I suppose if I were a clearer-headed thinker, I'd just stick to bigger formats, but some of those little 35mm cameras are just *so* delightful to use!

    -NT
     
  10. JRJacobs

    JRJacobs Member

    Messages:
    238
    Joined:
    Feb 28, 2008
    Shooter:
    Medium Format
    Certain brands of film are just very curly by nature, where other ones dry very flat. Worst one I ever saw was Arista.EDU 200 in 120 format - curls into a tight little cylinder when dry (oddly enough, the 35mm version of this film does not do this). FP4+, on the other hand, dries very flat. If the curl bothers you with the film you are using, try a different version. Dealing with curly film can be frustrating in the darkroom.