Developed HP-5 120 shows paper backing?

Discussion in 'B&W: Film, Paper, Chemistry' started by PCGraflex, May 14, 2005.

  1. PCGraflex

    PCGraflex Subscriber

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    All,

    Developed my first roll of HP-5 after a 5 year hiatus from my own B\W work. :smile:

    Used Ilfosol-S at 1+9 and the developed negs are a bit underexposed. (This was a mystery roll in that no exposure info was recorded)This roll was from a 17 roll lot that I had in the freezer that I didn't get around to processing at the time. They have been kept in the freezeer since exposed.
    I can see faint images of the paper backing and numbers in the sky areas of the negs. :surprised:

    I have not seen this before.

    Can anyone shed some light on this? :confused:

    Thanks,
     
  2. Magnus

    Magnus Member

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    Maybe the film got moist. One of the first films I ever developed was the paper roll which I spooled on to the spool (with great difficulty!) and threw the film away....
     
  3. 127

    127 Member

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    The obvious explanation is that it's been exposed throught the backing paper, by loading or unloading it in bright light.

    However I've had the same effect from older film, and I suspect that the ink can react with the emulsion over long periods of time.

    If it were exposure through the paper then each frame would have it's OWN numbers on it (taking into account the three different numberings), while if it's an ink reaction then it would have the number of a frame before or afterwards, depending on if the reaction was before or after exposure.

    Ian
     
  4. PCGraflex

    PCGraflex Subscriber

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    Ian,

    I know I didn't expose the film through the backing paper. If that was happening it would probably show up within the first frame as the film back would have been closed. I think you are onto something regarding the ink reacting to the emulsion with older films. Every frame you can see just a faint numbering in the film.
    Now, I just processed another roll and it doesn't show any paper backing markings. I have another 15 rolls to develop so I will see if any more show up.
     
  5. richard littlewood

    richard littlewood Member

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    I had just 1 roll of FP-4 to develop. Along with this recent film I dev'd a roll of 120 FP-4 that I found in a collection of photographic junk that never usually sees the light of day. This roll was at least 15 years old. 2 things surprised me, 1, the paper numbering was clearly visible but feint on the exposed frames only. 2, the film base was much thinner and really difficult to load into a spiral. All I concluded from this - as it says on the box, develop soon after exposure!