Rinse aid

Discussion in 'B&W: Film, Paper, Chemistry' started by Schlapp, Nov 25, 2007.

  1. Schlapp

    Schlapp Member

    Messages:
    740
    Joined:
    Nov 18, 2004
    Location:
    Isle of Lewi
    Shooter:
    Medium Format
    I have been using a Fotospeed RA50 rinse aid for the last wash of some 35mm film and have found that if I leave it in the rinse aid/water the emulsion comes off. Is this normal? What am I doing wrong please?
     
  2. Dave Miller

    Dave Miller Member

    Messages:
    3,894
    Joined:
    Dec 22, 2003
    Location:
    Middle Engla
    Shooter:
    Medium Format
    Nothing, possibly other than using rinse-aid. What film was it and have you had any trouble before? What water temperature?
    I recommend that you just use distilled water for the last rinse, your film should dry mark free.
     
  3. pentaxuser

    pentaxuser Subscriber

    Messages:
    8,202
    Joined:
    May 9, 2005
    Location:
    Daventry, No
    Shooter:
    35mm
    Hi. I hope island life agrees with you and the withdrawal systems of not having to brave rush hour traffic around Manchester aren't too severe. I take it that RA50 is basically the same as Ilford Wetting Agent. I have used this after rinsing since first going on an evening class B&W course in 2003. I must have put dozens of 35mm films through it. No problems with any. Of course the film is only in it for about 2 mins.How long was yours in it?

    At the evening class it was a pity in some ways that students didn't leave their films in the wetting agent for a long time then I could have said that even then, no-one had any problems. I don't think anyone went away for say 30 mins, leaving their film in the wetting agent tank but I don't know. However the tutor had dealt with a lot of classes and knowing what students are like, I feel he would have warned us about not leaving film in the agent if this was likely to happen. I can't say that the agent was Ilford but the dev and fix were so it's likely that it was.

    So that experience at nightschool combined with what wetting agent is and does suggests that the problem may lie elsewhere as Dave suggests. Things such as temp and maybe dilution or batch of rinse aid? Key to cause is whether Fotospeed RA50 is new to you. Like Dave, I take it that it has never happened before but of course you may have dispensed with rinse aid until now.

    Sounds as if it has completely ruined your film. If rinse aid has this potential it sounds serious enough for manufacturers to issue grim warnings on containers and I have never seen any. It's a real mystery to me. My condolences.

    pentaxuser