Foggy band on home-developed negatives

[James Carandja]

Hi all,
I'm pretty new to B+W negative development (35mm and 120) but enjoying it tremendously. However, I'm often getting the effect where some of the negatives come out with a mainly horizontal stripe (white once the negative is reversed) which can be foggy or quite distinct. Sometimes there are strata within the band.

The band is usually in the main body of the negative - half to two thirds down, which is particularly annoying as I can't crop it out. I expect this is a well known problem, so sorry to have to ask, but it is so difficult to know how to search for this on the forum!

I'm using a small changing bag, then 2 reel "AP" developing tank with ilfosol 3. Finally I scan them in. The same effect occurs with different film/camera combinations. The example is OM-4 loaded with HP5.

Any advice appreciated!

 

[HiHoSilver]

FWIW, James, I have a similar issue where the line is usually dark or black. I sometimes suspect the scanning, but I don't know for sure. Your thin line (mine is also thin) would argue against a light leak - which would be more dispersed fog. 'Hope I can learn some from this thread also.

 

[John Bragg]

Hi James do you use a film squeegee to remove water ? They are notorious for damaging film, also.when they get old, they can leave a black deposit.

 

[Svenedin]

If you examine the negative in good light can you see this flaw? Angle the negative in the light and see what you can see. Is it a scratch or a drying mark? I use a changing bag and scan too because my darkroom is not yet resurrected. It is easy to scratch film in a changing bag by catching the film on something else in the bag. +1 for squeegee damage no matter how careful. It looks more like a drying mark though. My water is very hard so I switched to battery top-up water for the final rinse with a tiny quantity of rinse aid and the situation is better but not perfect. Most of the marks on my negatives cannot be seen when projected using my enlarger so I suspect they would not be seen on a print but cannot confirm until darkroom ready.

 

[Ian Grant]

As it's different films and cameras that seems to rule out a camera issue, it's unlikely it's happening during processing, although I suppose a tiny pin-hole light leak in the changing bag might be one explanation but I would expect it be more random.

You need to check the negatives themselves use a loupe or the standard lens off the camera if it's on the negatives then look for a light leak. If it's not on the negative check the scanner it may be dirt internally. I guess you could set the scanner to scan a negative, then scan with nothing in the holder if the line shows up there's the culprit.

Welcome to APUG BTW

Ian

 

[Doremus Scudder]

Scan a neg, then turn it 90° and scan again and see if the line changes orientation or not. If so, then it's definitely in the scanning.

Doremus

 

[James Carandja]

Thanks all
To pick up some of the good points here, I've had a close look and the mark is definitely in the negative, not the scan. It appears to be in the image though, not a surface artifact.

I have used various things for drying including - nothing at all, gloved fingers, kitchen towel, chamois leather (disastrous BTW) and clean kitchen sponge.

I've uploaded another example which perhaps shows the effect more clearly, this time 120 film from a Lomo Diana F+. This example is very typical, a mostly straight line, sometimes segmented. I hope this might be a reference to others.

POSSIBLE ANSWER
It's funny how asking the question sometimes prompts you to come up with an answer yourself, even after weeks of pondering: I think I may have been wearing my Fitbit watch inside the changing bag! This watch periodically emits a green pulse of light which could illuminate the spirals and splash on to the film. Possibly this could explain why the effect isn't quite at the edge.

This is really stupid I know, even if it isn't the answer. I can only put it down to the over-excitement at home developing.

I'll post confirmation one way or the other when I next develop a roll, and thanks again for all suggestions.

 

[HiHoSilver]

Scan a neg, then turn it 90° and scan again and see if the line changes orientation or not. If so, then it's definitely in the scanning.

Doremus

So simple & so effective - feel silly for not thinking of it. Thank You, Doremus.

 

[canuhead]

the watch could be the cause. guess you'll be doing tests with and without the Fitbit. a reason why my iPhone stays outside the film loading room

 

[jvo]

...
POSSIBLE ANSWER
It's funny how asking the question sometimes prompts you to come up with an answer yourself, even after weeks of pondering: I think I may have been wearing my Fitbit watch inside the changing bag! This watch periodically emits a green pulse of light which could illuminate the spirals and splash on to the film. Possibly this could explain why the effect isn't quite at the edge....

AH HAH!!! another reason for me to avoid the gym today, "i'll ruin my negatives!"

welcome to apug!

 

[Doremus Scudder]

James,

The second image you posted definitely looks light-struck. I think you're on to something with your FitBit.

 

[winger]

I was about to load 4x5 holders when I noticed my fitbit pulse. Ever since, it goes in my pocket when the lights go off in the darkroom. I'd definitely suspect this as a likely cause. Please let us know if a roll without it comes out fine.

 

[piu58]

The first one may be a streak from wetting agent. It is easy to use too much from it, and the streaks are hard to remove without scratching the negative. I use a real homeopathic amount of it and remove the remaining water with a film squeegee . No more issues from that point.