Resensitising film?

Discussion in 'B&W: Film, Paper, Chemistry' started by Athiril, May 18, 2009.

  1. Athiril

    Athiril Subscriber

    Messages:
    2,961
    Joined:
    Feb 6, 2009
    Location:
    Melbourne, V
    Shooter:
    Medium Format
    Hey, I have a theoretical question in regards to my research towards my final project in film school.

    After I have shot some black and white film, and say developed it (but not fixed, and still in dark tank), is there a way to chemically remove the latent image, or to 'reset' the silver to it's original state, so that in theory I can dry the film in the dark and then use it to shoot something?

    How about after toning? Or bleaching (but no fixing - ie: converting to silver bromide but no removal of silver from the film)?
     
  2. Ian Grant

    Ian Grant Subscriber

    Messages:
    18,143
    Joined:
    Aug 2, 2004
    Location:
    West Midland
    Shooter:
    Multi Format
    In theory perhaps but in practice the bleaches needed cause massive speed loss and I think you also lose Panchromatic sensitivity. If it could be done people would use it to rescue fogged papers.

    Ian
     
  3. Christopher Walrath

    Christopher Walrath Subscriber

    Messages:
    7,129
    Joined:
    Dec 30, 2005
    Location:
    Two inches to the left
    Shooter:
    Multi Format
    Wirelessly posted (BlackBerry9000/4.6.0.167 Profile/MIDP-2.0 Configuration/CLDC-1.1 VendorID/102 UP.Link/6.3.0.0.0)

    Could it even be done after develop and a stop? I mean you couldn't rinse the film in water and that might act as a mild fix and you would still have chemistry on the film. And if you were to redevelop you could seriously increase negative density. Just seems that way to me.
     
    Last edited by a moderator: May 18, 2009
  4. Photo Engineer

    Photo Engineer Subscriber

    Messages:
    25,931
    Joined:
    Apr 19, 2005
    Location:
    Rochester, NY
    Shooter:
    Multi Format
    I do know that you can remove the silver halide and leave the latent image behind. BTDT. It is in one of the catalytic imaging patents I co-authored. But, I forget the details.

    PE
     
  5. Athiril

    Athiril Subscriber

    Messages:
    2,961
    Joined:
    Feb 6, 2009
    Location:
    Melbourne, V
    Shooter:
    Medium Format
    Well what I would like to do theoretically, is to stain/dye/tone the silver a certain colour before shooting an actual image.

    I figured it could be done if you were to fog the film, develop and tone, then re-sensitise, side-effects as decreased speed wouldn't be an issue.

    Perhaps just trying to stain/dye/tone the film with no fogging/developing would be the way to go, Im not sure how that would work.
     
    Last edited by a moderator: May 18, 2009
  6. keithwms

    keithwms Member

    Messages:
    6,070
    Joined:
    Oct 14, 2006
    Location:
    Charlottesvi
    Shooter:
    Multi Format
    Why not just overlay one stained neg with another unstained neg.
     
  7. tiberiustibz

    tiberiustibz Member

    Messages:
    1,749
    Joined:
    Oct 22, 2007
    Location:
    Tufts Univer
    Shooter:
    35mm
    Why don't you develop the rest of the silver and then bleach it. That way the bleached halide will all have the same characteristics rather than two different ones. You'll lose speed and sensitization AFAIK and be left with a slow blue sensitive emulsion. Have fun.
     
  8. Athiril

    Athiril Subscriber

    Messages:
    2,961
    Joined:
    Feb 6, 2009
    Location:
    Melbourne, V
    Shooter:
    Medium Format
    That's exactly what Im after for my reseach report.

    So if I pull the film out to the light to expose it, so it's completely exposed, completely develop it, tone, then bleach, then dry in the dark and reload, it'll be ready for shooting again at much reduced sensitivity and limited spectral sensitivity (to whatever the toner absorbs)? That's exactly what I'm looking for, for my report.