Black spots in the negative??

Discussion in 'Darkroom Developing and Printing' started by Jorge Omar, Dec 27, 2003.

  1. Jorge Omar

    Jorge Omar Guest

    Hello,

    From time to time, I get some black spots in my negatives (white spots on
    prints, slightly fuzzy).
    They are not dust specks - they are real dots in the emulsion (I've used
    a 10X loupe to look at them).
    I went from tap water to spring water and it seemed to help, but did not
    eliminate them completelly.

    Could someone post which are the likelly reasons so I can do a systematic
    elimination of the causes?

    Thanks,

    And a very good 2004 to all.

    Jorge
     
    Jorge Omar, Dec 27, 2003
    #1
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  2. Jorge Omar

    Jeff Novick Guest

    A form of dirt? Precipitation from developer? The question is, can it be
    'scraped' off or is it really in the emulsion? Occassionally, I'll get some
    black specs on my negs that can usually be rubbed off. I don't recall
    anything like this in the emulsion. Usually a good water filtration system
    is necessary.
     
    Jeff Novick, Dec 27, 2003
    #2
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  3. Jorge Omar

    Bruce Osgood Guest

    From time to time, I get some black spots in my negatives (white spots on
    I've had this problem on many occasions and traced it back to repeated uses of
    the same FotoFlo. I switched to 1 shot use and so far the problem has gone
    away.
    Bruce
    Brooklyn, N.Y.
     
    Bruce Osgood, Dec 27, 2003
    #3
  4. Jorge Omar

    R.W. Behan Guest

    Second both "motions" above. A similar problem years ago (in a rural
    community with a questionable water supply) was solved by rubber-banding a
    4x4" gauze pad over the water faucet spout. Filtered water cleared up the
    difficulty. And one-shot Photo-Flo is inexpensive insurance. Let us know
    if these suggestions work.
    Cheers,

    Dick Behan
     
    R.W. Behan, Dec 28, 2003
    #4
  5. Jorge Omar

    Jorge Omar Guest

    Thanks, guys. Looks like a filter is on its way...

    Jorge
     
    Jorge Omar, Dec 28, 2003
    #5
  6. Jorge Omar

    Jazztptman Guest

    Good answers so far. If the spots can be cleaned off with gentle rubbing during
    a rewash, then they may just be dirt in the water. If you store and reuse
    Photoflo for several days or weeks, it can get bio-growth building up which
    could caue the spots.

    If the spots cannot be removed and appear on close examination to be spots
    developed up in the emulsion, you may have rust particles in your water supply
    or delivery system. These would cause a localized contamination and result in a
    developed image spot. Filtration and single use (or at least not keeping it mre
    than one day) for Photoflo should help.
    Bernie
     
    Jazztptman, Dec 29, 2003
    #6
  7. Photo-Flo is one chemical I wouldn't ever consider using except as a one-shot.
    Why take those kind of chances for that kind of pocket change?
     
    David Nebenzahl, Dec 29, 2003
    #7
  8. Jorge Omar

    Jorge Omar Guest

    That's a good bet (rust particles). Today, I'm living in an old building
    with iron piping (former home was a house with PVC pipes).
    And, BTW, photo flo is not the culprit, since I do not use it (too
    expensive where I live).

    Jorge

    (Jazztptman) wrote in
     
    Jorge Omar, Jan 2, 2004
    #8
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