120 ecn-2 stripe

[yonsama]

Hello. All my other films are fine, but this one is the only one showing this problem. What could be the problem?

 

[lamerko]

It appears that whoever rewound the film did not seal the paper properly, resulting in light leaks along the edges. At the upper end, one can clearly see alternating red and blue reflections, most likely caused by the different layers of the winding…

 

[loccdor]

It's interesting that the lines are perfect 90 degrees. I've never seen any light leak or developing problem with such a perfect angle.

 

[koraks]

I'd like to see a photo of the actual film as seen by the naked eye - no scan, but a photograph of the actual film held against a backlight.

 

[MattKing]

It is strange that the streaks are dark in the positive.

 

[koraks]

There's more strange stuff. How about the red color that seems to be inside the sprocket holes:

Hence my question to be shown the actual film, just to remove any additional complications from scanning/digitization.

 

[lamerko]

In my opinion, this is the result of light leakage between the layers, when light passes between the front and back sides of the film, probably through the backing itself.

 

[koraks]

But how do you explain this:

That's lower density, transitioning into pure black (base/no density).
If what you say is correct, then the definition of the lower sprocket edge would still be sharp as this is apparently a scene of a tree against a stretch of sky. The sky would continue into the sprockets, so those should have a sharp edge.

Again, let's have a look at the actual film.

 

[lamerko]

What I can assume is that it was photographed with a phone or a digital camera at a slight angle. The upper edge is distinct and in focus, but the lower one is definitely blurred. Perhaps the direct light from the light table in this case has enhanced the "smearing" But it is definitely something strange - I flipped the image and corrected it using the red areas immediately along the perforation. The result, if the negative really looks like this, is somewhat unsettling…

 

[brbo]

I've seen something similar as a scanning artifact on Noritsu scanners. Although only on a BW film with high contrast and clear base or if you punched a hole in a film (which is consistent with OP's case as sprocket holes are in the image area). Transitions from zero density to higher density would produce such artifact running parallel to sensor orientation.

I'm about 98% sure this is a scan from Noritsu scanner. They are definitely not designed to "see" zero density (on a film scanned as negative) in the image area.

edit: Found my test scans when I was trying to find a solution to this...

This is a strip of film with totally opaque material taped to it and a hole punched through it.

(scanned as a colour negative)

(scanned as a positive)

Also checked exif on OP's image and it WAS scanned on Noritsu scanner. I'm now 99% sure that the film is perfectly fine and this is just a scanning problem...

 

[FredK]

120 film is not perforated. Thus, I am assuming that this is 65mm film that someone or you purchased and is marrying up with some sort of backing paper and winding into very tight rolls. What you are seeing is pressure banding formed because within the ECN film are subtle height differences in the perforation areas which are formed when the film is perforated. These subtle differences are then causing stress bands across the film as the film and paper are being tightly wound. It could also be formed if the sprocket moving the film is too wide or narrow and applying undue stress on the emulsion surface. What is happening is that the fast yellow grains are being pressurized. Backing paper smoothness is critical for not aiding in applying pressure.

The winding affect I am talking about is similar to what people see on their windshield when old wipers become hard where there is a type if skidding across the windshield. With the height differences of the film and roughness of the paper, the skidding between the two is forming pressure. With 500T film, we used to say that if you looked at it the wrong way in the dark, it would pressurize.

If you have any of the 65mm film that has not been spooled, take a snippet of a few inches and cut and process to see if the bands appear on the original unspooled sample. If they do not, then the issue lies in how you are spooling.

 

[koraks]

@FredK the pressure banding is an interesting hypothesis and it might be part of the problem. Without wanting to be overly critical, I would still want to point out that there are scanning anomalies within the sprocket holes as I've pointed out also in #6 above:

Please also refer to #10 above which reports problems with some scanners when trying to scan the entire film strip, including sprocket holes.
I feel this needs to be excluded first before we try to find actual process or emulsion problems.

So far we've not seen @yonsama back to confirm whether the anomalies within the frame area are actually visible on the negatives to begin with.