Interesting streaks

One of my students was cutting down some negatives when he discovered a strange yellowish strain on several of the negatives. 120 tri x

It doesn't cover from edge to edge , and doesn't show up on each frame and only on one roll

I have never seen this before. My first thought was fixer but since it didn't effect every frame I am at a loss

Any thoughts?
Thanks

Ann

Without images of the negative it is hard to guess, but a safe bet would be to refix, wash and dry the negatives.

scan and/or photograph of negs would give us more to go on.

streaks from edge sounds like something in devlopment went wrong. Possibly slow fill of tank with chemical dribbling down neg. But why they would be yellow I don't know unless it was some kind of staining developer.

I undstand but here in the lab we can't do that. I will see if he can scan it at home and email me the file and then I can download to the question

Hi Ann

Your first thought spot on refix and wash again as soon as possible.
If it disappears review fixing rules.

Noel

Xmas said:

Hi Ann

Your first thought spot on refix and wash again as soon as possible.
If it disappears review fixing rules.

Noel

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Ann, listen to the man.

Say, Anne . . .is that a paying gig?

APUGuser19 said:

I only clicked on this because it was a recent thread with few posts, about an odd photographic subject. I see these wild and crazy problems pop up from time to time. I've never had any of it. I just have always used the Kodak processing procedures ingrained in me for 45 years, and never had any of it. Yellow stains... Let's see... not on the whole roll, just on areas. The film got bunched up and wavy on the reel and inadequate or improper fixing, possibly attributable to the former. No other explanation. Probably using plastic reels.

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Disagree the streaks are an all to frequent problem.
The primary cause is inadequate fixing mostly films are loaded ok cause you would get uneven development as well as streaks that vanish after refixing, yes that can happen but much less frequently.

We have reams of posts about developer selection, dilution, temperature, time, stop baths when the critical thing is fixing and washing.

Fixing time is dependent on

Fixer type
Dilutation
Film type
Exhaustion of fixer
Temperature
And agitation

Mainly

I always fix by inspection
- if you use an acid stop it is safe to fix in daylight after you pour the stop out
- if you use sodium thiosulphate it is safe to open tank after 4 minutes of fixing and continue in day light.

Or you can use the leader of the film you are developing in fix you are to use with caution,

When the film clears fix for at least the same time again.

Then use Kodak hypo clear as per Kodaks instructions or scratch mix an equivalent.

Yes I get paid

Have been teaching this class for over 25 years and doing darkroom work for 67 but as I said never seen this issue(although)a lot of others) so I thought I would double check my thoughts with others

Perhaps the film was touching itself from being improperly loaded. I've seen that create white areas on the film where the two touched, but not yellow...

the question is why are there streaks. A film fully submersed in dev or fixer properly won't cause streaks. Streaks are usually caused by dev dribbling down film as dev is being poured in too slowly. I suppose the same could happen with fix being poured in too slowly but I have never seen that.
But yellow streaks is very odd. If refixing clears the streaks then all well and good.

More information is required.
Dev being used time of dev and agitation routine
Stop being used
Fix being used and time of fix and agitation routine
Type of tank (paterson, jobo, steel etc)

Speed of filling tank
Was tank tilted during filling

Hi Rob

You have been a good boy or very lucky to date, well done.
If you don't fix proper you can get streaks without any improper loading.
I think this is from lack of agitation and fixing been needed non uniformly.
They can be called bromide drag as well cause they will 'flow' from sprocket holes.
They are yellow, they do dissappear but you need to refix ASAP.
And you need to try and fix and wash better, note Rob not you instead the people with yellow streaks.

Noel

i have asked him to scan and email a copy to post. The strangest thing is where they are found, it is not bromide drag. It isn't a result of the film touching during the process, and they aren't found on the entire roll or on any of the other rolls developed at the same time just in the middle of the roll.

I told him to remix and wash right way, but my sense is he went his own way, and sense this is not a class for credit there isn't much i can do except recommend and go over procedures . Some people just are stubborn and ,,,,,,,,,,,

patterson reels, hc110 solution b kodak stop bath ilford fix 1:3. time of fix should be 5min with inverted agitation once every 30 seconds. the usual basic method. i am not in the darkroom with them at this stage of the class when developing film so to the speed of filling, and other areas of this sort i can't comment. I know what was taught and demonstrated, but unless i am standing next to them while they process their film it is hard to know. I am there the first few times they develop film, but then they are on their own for that process.

it will be interesting to see if it occurs again and with another student.

in my 67 years of doing darkroom work i have probably made every mistake in the book and out of the book but never had seen this.

thanks for the suggestions and input

HiAnn

The latest 35mm Tx seems to fix slow but 5 mins in ilford at reasonable temperature should have been ok.
I always open tank after 3 to 4 minutes and watch the slowest film in multi tank clear milky and double time I use plain sodium thiosulphate.

I've seen the yellow stain a lot in other peoples neg files.

Noel

I expect that ann will agree with this.

Students who use shared darkrooms seem to be able to find problems that no one else will ever see.

MattKing said:

I expect that ann will agree with this.

Students who use shared darkrooms seem to be able to find problems that no one else will ever see.

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Lol for sure

MattKing said:

I expect that ann will agree with this.

Students who use shared darkrooms seem to be able to find problems that no one else will ever see.

Click to expand...

A chum waved a negative file under my nose last August 15 and asked what is wrong.
So you are in denial?

Sounds like dichroic fog to me, that can happen when stop bath isn't used or has collapsed and become alkali and occurs in the early stages of fixing.because there's un0neutralised developer carry over in the emulsion.

Ian

Is streaking still in fashion?

RobC said:

Is streaking still in fashion?

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I still get streaking. Not on the film or paper; more like shoot a lot of film in a short time, separated by processing and printing streaks.