Strange black blur spots on 4x5 320 Trix

[gerardboyer]

Hi everyone,
it's my first time I write here askinf for help.
I spoke with colleagues, people that are LF professional for years, and nobody saw this. I'll attach an image.
Triying to resume dev process.
1. using distilled water all the time at 20 Celsius degrees.
2. prewash, develop, etc as Ilford or Kodak standard process.

I have a doubt, could be this black spots about distilled water, or something occur when insert or extract sheet film from holders ¿?

Every answer for me is good to know.
Thanks!!!

Gerard

[Chuck Pere]

Always a good idea to first look at a sheet of film straight out of the box and see if it shows any problems. If it's clean you can move on to looking at processing problems.

[paulbarden]

What film did you use, and is it within its freshness date?

[Bruce Watson]

Hi everyone,
it's my first time I write here askinf for help.
I spoke with colleagues, people that are LF professional for years, and nobody saw this. I'll attach an image.

I have a doubt, could be this black spots about distilled water, or something occur when insert or extract sheet film from holders ¿?

Dark spots on a positive (print) are caused by light spots on the negative. This usually indicates a lack of exposure. And this usually indicates dust blocking the light from the lens. If the spots are sharp and well defined, the dust is on the film at exposure time. If the spots are fuzzy and poorly defined, they are floating between the lens and the film (they are out of focus). People often forget to clean the inside of the bellows. Just sayin'.

So, first thing I would do is put that film on a light table and look at the spots with a loupe. What do you see?

[Alan Klein]

As an aside, I'm new to 4x5 and have trouble getting my fingers all over the film when I insert it into the holder and remove it. Gloves don't work for me. I do wash my hands very clean before doing this and dry them well to eliminate skin oils and sweat. Will inadvertently touching the film cause any issues?

[Bill Poole]

Using a filter? I have seen similar with dust on filter and small aperture.

[lab black]

If you are using a developer that you have mixed from powder, consider filtering the developer before use. A funnel and a coffee filter can be used.

[gerardboyer]

Always a good idea to first look at a sheet of film straight out of the box and see if it shows any problems. If it's clean you can move on to looking at processing problems.

Thanks, I inspect it and was clean.


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[gerardboyer]

Dark spots on a positive (print) are caused by light spots on the negative. This usually indicates a lack of exposure. And this usually indicates dust blocking the light from the lens. If the spots are sharp and well defined, the dust is on the film at exposure time. If the spots are fuzzy and poorly defined, they are floating between the lens and the film (they are out of focus). People often forget to clean the inside of the bellows. Just sayin'.

So, first thing I would do is put that film on a light table and look at the spots with a loupe. What do you see?

Hi Bruce, it’s a possibility to have dust on film, on Monday I attach a detail scan of this marks. This spots are well defines on the scans, but always different. This two pictures, are from two sheets of six batch in a jobo 2500, developed in a cpe2 plus as always. Thx!

[gerardboyer]

As an aside, I'm new to 4x5 and have trouble getting my fingers all over the film when I insert it into the holder and remove it. Gloves don't work for me. I do wash my hands very clean before doing this and dry them well to eliminate skin oils and sweat. Will inadvertently touching the film cause any issues?

Probably Alan, but I take care of it, the marks are different
Thx