Have you seen these chemical stains?

Discussion in 'The Darkroom' started by livingadejavu, Mar 20, 2017.

  1. livingadejavu

    livingadejavu TPF Noob!

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    Hi all!

    I got some film of mine developed at a lab and I've been seeing these weird shadow-y marks around the sprockets.

    the lab uses Fuji chemistry and I shoot both Kodak and Fuji, weirdly enough I only see it on Kodak film. 19839_CGA_Personal_002-S1-0031.jpg

    Let me know if you have any ideas of what it could be! 19839_CGA_Personal_002-S1-0031.jpg


     
  2. vintagesnaps

    vintagesnaps Been spending a lot of time on here!

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    Looks like the film might not be feeding thru the camera properly so you're seeing the edge of the sprocket holes. Look at the negatives - are the exposed frames closer to one side of the strip of film than the other instead of being centered?
     
  3. Derrel

    Derrel Mr. Rain Cloud

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    I think it's developer that's gushing through the sprocket holes, causing uneven development at the edges of the film. I HAVE seen that before, but with tank-developed B&W film that was agitated too vigorously with strong developer. I have not seen this on color film before, but it looks very similar. I am not sure how the lab is developing the film, but I suspect they have a quality control issue if you're seeing this regularly. C-41 process color negative film brand shoukld not affect this, but you're seeing it on Kodak film but not Fuji: that seems odd.
     
  4. vintagesnaps

    vintagesnaps Been spending a lot of time on here!

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    Same camera or not? Same side every time? Are these scans or prints? Shouldn't be seeing the sprocket holes at all so something doesn't seem to have been aligned properly.
     
  5. livingadejavu

    livingadejavu TPF Noob!

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    So it's not in the film itself, it's definitely on the film, on the emulsion side. You can kind of see it in the picture I attached. I don't think it's a camera issue, I've used different cameras. (These are all scans fwiw)

    I do know it's a dip and dunk tank and they appear to be mostly happening at the top and bottom.
     

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  6. Derrel

    Derrel Mr. Rain Cloud

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    Now that I see this more closely, I am wondering if the camera back's light seals are absoluitely 100% light-proof...wondering if a very slight amount of light is leaking into the camera back,and is coming through the sprocket holes as the film is wound onto the takeup spool. This could be so,so little light leakage that the degree of exposure is at the level that it really barelty has any effect, except where light comes through sprocket holes.

    Hmmm...I was thinking of much larger, more-diffused "surge marks", but these look different.
    ***RE-reading your post: wondering if the Developing lab's "ID flashing" machinery might be emitting a tiny bit of light as the rolls are loaded? At the start of every roll, an ID number is often "flashed" onto the roll. Wondering too if the light MIGHT be from static electricity flash from the film loader/opener mechanism....regardless, if this happens on multiple rolls from more than one camera, the issue is almost certainly the fault of the lab and its machinery or working processes.

    The fact that the blemish is slightly offset from the sprocket holes...when film is wrapped onto itself, any flash or static that comes through the sprocket holes is offset, based on how many "wraps" the film has made onto itself, so the sprocket hole are literally, offset from one wrapped layer of film to the underneath layer of film.

    I dunno...
     
    Last edited: Mar 20, 2017
  7. john.margetts

    john.margetts No longer a newbie, moving up!

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    The agitation issues Derrel mentions are usually streaks rather than defined edge marks so I would with Derrel's later idea of slight light leaks.

    On the plus side, they should be amenable to post-processing.
     
  8. jcdeboever

    jcdeboever TPF Supporters Supporting Member

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    On the next roll, I would gaffer tape the door edges and film window if it has one to rule out a light leak. That's what it looks like to me.
     
  9. vintagesnaps

    vintagesnaps Been spending a lot of time on here!

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    I wondered if these were scans because when I've had film developed and scanned I've never noticed seeing edges of sprocket holes at all. The negative holder/carrier would allow light to pass just thru the frames of film so I thought maybe something was out of whack.

    I don't see it in the photo but if it's on the developed film maybe check with the lab. Is it mostly at both ends of the roll, not at each end of cut strips? I'm wondering if something with the equipment is holding the film slightly tighter at both ends, that it's pressing slightly against something.
     
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  10. livingadejavu

    livingadejavu TPF Noob!

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    Hi all!

    It's definitely not a light leak, tried a few different cameras and if it were wouldn't the marks show up on the Fuji film also?

    I can see a little pooling under the sprockets, i'm thinking maybe that's what it is? maybe the perforation of the sprockets on the kodak isn't as clean cut as the Fuji?

    I've called around to a few labs to see if they're seeing this also and they say they are seeing it sometimes with kodak film.
     
  11. gsgary

    gsgary Been spending a lot of time on here!

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    Could be too much agitation
     
  12. vintagesnaps

    vintagesnaps Been spending a lot of time on here!

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    You could try asking on Film Photography Project's forum or their Flickr discussion group, or APUG (analog group) if anyone's seen this before.

    Is it noticeable in the frames? on the actual photographs? I'd have to go get out some of my negatives to see if I notice it because I've never noticed it on any of my photos from the negatives. You shouldn't be seeing the sprocket holes at all on a finished print (unless someone's using a camera purposely that will give that effect).
     

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