Bleach and redevelop impossible integral film

Discussion in 'B&W: Film, Paper, Chemistry' started by rbrigham, Jun 21, 2013.

  1. rbrigham

    rbrigham Member

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    Hi

    I am trying to Bleach and redevelop impossible silver shade film to intensify and tone them

    I have a number that I peeled to get the b/w transparency which I have bleached in ferricyanide/potassium bromide
    then I redeveloped in multigrade developer which all works ok except that the emulsion starts to lift

    Has anybody got a suggestion for how to fix the emulsion layer so it dose not lift leaving me free to redevelop/tone etc

    thanks

    robin
    London
     
  2. Rudeofus

    Rudeofus Subscriber

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    You can try hardening the film before you bleach(a few ml Formalin per liter of water would do that), or you can try a different rehalogenating bleach. Any C41 or E6 bleach should work, just make sure it's not a BLIX. See here for a recipe (you can leave out the Ammonium Nitrate).
     
  3. rbrigham

    rbrigham Member

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    Thanks Rudeofus

    I have some tetenal hardener somewhere
    do you think that would work ?

    i also found 500ml Buffered Formalin 10% on the web in England
    would that be an appropriate dilution

    thanks

    robin
     
  4. Rudeofus

    Rudeofus Subscriber

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    Tetenal hardener is Alum based which means it needs pH lower than 5 to work. Since it is normally used together with fixer, the hardener alone will likely have very low pH. Too low a pH can also soften the gelatin, which means you may actually make the problem worse if you are not careful with this product.

    Even if you get the pH up to 4.5 or so I still can't tell you whether it will completely solve your problem but it will be an important step in the right direction. Try it with a test clip before you commit a whole roll of film.
    PhotoEngineer once gave a recipe for E6 final rinse which asked for a few ml of Formalin 37% per liter of final rinse. With your 10% Formalin you should use about 20 ml per liter hardener. Don't use 10% Formalin as it is likely too strong for hardening, and make sure you read the safety instructions before using Formalin.
     
  5. Alessandro Serrao

    Alessandro Serrao Member

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    There's a Rollei product, RBM5, a glutaraldehyde based hardener, to be used in the developer.
     
  6. AgX

    AgX Member

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    In advisng the use of an Aldehyde as hardener you all assume the receptive layer to have gelatin as binder.