How did this black line appear on my negative on the image side of the sprocket holes?

js98367 · Aug 12, 2016

I used my Nikkormat FT2 with TMax 400 that I loaded from a 100 foot roll. Images came out fine.

MattKing · Aug 12, 2016

Might be a small leak in the bulk cassette near a cap.

js98367 · Aug 13, 2016

MattKing said:
Might be a small leak in the bulk cassette near a cap.

It appeared on both sides of the film, on the image side of the sprocket hole. I wonder if the film advance roller with the teeth made those marks because the film had too much tension for some reason? The film advanced normally - I didn't feel like I was working the advance lever too hard. It felt normal. A mystery to me.

Xmas · Aug 13, 2016

Did you use a bulk loader or straight from can? Could be physical stress rather than light. You need to tell us more.

StephenT · Aug 13, 2016

I'd vote for a stress mark like you said. I haven't gotten many on 35mm, but have to be REAL careful with 120.

Old-N-Feeble · Aug 13, 2016

Could be a sprocket trying to lock up. You did push the rewind button before rewinding, right?

kreeger · Aug 13, 2016

I have seen that before - it is fog associated with the film abeing under uneven torque from the film advance roller's teeth.

AgX · Aug 13, 2016

Old-N-Feeble said:
Could be a sprocket trying to lock up.

How could a sprocket wheel produce lines longer than one bridge? What would transport the film in the meanwhile that sprocket wheel is idle?

js98367 · Aug 13, 2016

This is from a new roll of TMax 400. I just rolled two more 15 exposure rolls with different cartridges, did some test shots with my FT2 and my Nikon FE, and processed the film this afternoon.

The same stress marks are on both strips of negatives. I don't think I have a problem with my cameras.

The sprocket holes are not stressed and there was no powdered emulsion or film base debris in the film path of either camera.

The picture area of the film is clear and the negatives look great.

Maybe the sprocket hole punching machine at Kodak needs some adjustment.

I can live with this. I was curious about its etiology.

Mr Bill · Aug 13, 2016

js98367 said:
I can live with this. I was curious about its etiology.

Hi, I don't have any good explanation of what caused it, but I'd also be curious. My main fear is that it might be the beginning stage of something that might get worse later, possibly losing some good shots.

I think I'd probably open up the bulk loader (in the dark, of course) and pull out a foot or so of film, marking it somehow, and process it. If you find the "fog" on the internal part, at least you'd know it's not from anything you're doing.

MattKing · Aug 13, 2016

Mr Bill said:
If you find the "fog" on the internal part, at least you'd know it's not from anything you're doing.

Unless it has something to do either with handling of the bulk roll or something in the development stage.

I note a fair amount of colour fringing around the edge of the film and the marks. How did you get the image uploaded?

Mr Bill · Aug 13, 2016

MattKing said:
Unless it has something to do either with handling of the bulk roll or something in the development stage.

True enough. I'd develop in the dark, by hand, using a beaker to rule out any accidental fog (light or stress) related to the sprocket position. I can't imagine any way to cause this sort of effect internal to the roll without unwinding it, though.

js98367 · Aug 13, 2016

MattKing said:
Unless it has something to do either with handling of the bulk roll or something in the development stage.

I note a fair amount of colour fringing around the edge of the film and the marks. How did you get the image uploaded?

I snapped a quick picture with my iPhone and used it in the initial post.

js98367 · Aug 13, 2016

Mr Bill said:
True enough. I'd develop in the dark, by hand, using a beaker to rule out any accidental fog (light or stress) related to the sprocket position. I can't imagine any way to cause this sort of effect internal to the roll without unwinding it, though.

I don't have a darkroom. I use my Harrison tent and develop with Patterson tanks.

My next move is to develop a strip of film taking it directly from the bulk film loader into the Patterson reel using my H tent.

Alex74 · May 6, 2018

did you find out what it was?

Sirius Glass · May 7, 2018

Bromide drag

AgX · May 7, 2018

Bromide drag evokes a lesser density in a mid density area below a high density area.

Here we got a high density in a no density area.

Kino · May 7, 2018

Maybe the edge numbering machine drifted a bit and exposed just outside of the mask on that cut of the roll.

If it's outside the picture area, I wouldn't worry too much.

How did this black line appear on my negative on the image side of the sprocket holes?

js98367

MattKing

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js98367

Xmas

StephenT

Old-N-Feeble

kreeger

AgX

js98367

Mr Bill

MattKing

Moderator

Mr Bill

js98367

js98367

Alex74

Sirius Glass

AgX

Kino

How did this black line appear on my negative on the image side of the sprocket holes?

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