maurits
Member
- Joined
- May 10, 2009
- Messages
- 8
- Format
- 4x5 Format
I have spent several films (Fomapan 200 120) trying to find out what is causing the myriads of tiny black spots on my negatives, but still can not put my finger on this phenomenon.
Dead Link Removed
(300 by 300 px samples of negatives scanned @ 2400 dpi)
This is what I did. I exposed the film at ISO 100. Then a pre-soak in water at 20 degrees C for 5 minutes, develop in Pyrocat-HD 1+1+100 for 10 minutes at 20 degrees C. First 30 seconds continuous agitation, then for 10 seconds each minute. Stop with water at same temperature for 15 seconds, drain, pour fresh water, rinse for 15 seconds more. Fix in Ilford rapid fixer for 5 minutes at 20 degrees C, first minute continuous agitation and then for 10 seconds each minute. Wash for 15 to 30 minutes with running water and a final rinse with Amaloco wetting agent for about a minute. No squeegee or finger swiping, I hang up the film to to dry immediately.
I like the tonality and character of this film a lot, otherwise I would have given up after two films.
I then tried again with freshly made fixer. My tank, reels, cups etc. were all cleaned extra well beforehand. I also switched from a Paterson tank to a Jobo. I mix the developer using one A and one B marked 5 ml syringe. Solution A is stirred in the water first and then solution B is added. No inter contamination of the developer occurred. Same result, thousands of specks.
My next film I did the same as above, but now I used demineralised water in the last wash, together with the wetting agent. Yet again, thousands of tiny black spots. I took to demi water because some of these spots look like there is a minute particle on the negative, followed by a small trail of residue. May have been something in the water.
Then I tried the same procedure, but with Rodinal 1+50 at 20 degrees C. Even more black spots appeared on the negatives. Development in XTOL 1:1 at 20 degrees, no pre-soak, stopping in Ilfostop, fixing in Ilford rapid fixer and washing and rinsing with regular running water gave me less black spots. But they were still there.
Then I took some Ilford FP4+ in 4x5 sheets, exposed at ISO 64 and developed these in BTZS tubes for 8 minutes in Pyrocat-HD 1+1+100 at 20 degrees C (no pre-soak). Washing and rinsing in regular running water and Amaloco wetting agent in the last stage. The only difference was, like with the XTOL, that I stoppped the development process with Ilfostop (1 minute) instead of using water and no pre-soak. Result: no specks at all, perfectly clean negatives.
What causes this? The water stop bath, the pre-soak or a bad batch of Foma film?
It is not the developer, since Pyrocat-HD performed admirably with Ilford film and I get black spots with Rodinal and XTOL too. It is not the fixer that was freshly made and left no marks on the Ilford film, neither is it the wetting agent. It is not the tank or the reels, since I switched between Paterson and Jobo a few times and all were clean. Kodak Tri-X or Fujifilm in XTOL, ATM49 or Rodinal in the same tanks etc. comes out just fine. The demineralised water did not help, even though I only used it in the last stage.
Thanks, Maurits
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Dead Link Removed
(300 by 300 px samples of negatives scanned @ 2400 dpi)
This is what I did. I exposed the film at ISO 100. Then a pre-soak in water at 20 degrees C for 5 minutes, develop in Pyrocat-HD 1+1+100 for 10 minutes at 20 degrees C. First 30 seconds continuous agitation, then for 10 seconds each minute. Stop with water at same temperature for 15 seconds, drain, pour fresh water, rinse for 15 seconds more. Fix in Ilford rapid fixer for 5 minutes at 20 degrees C, first minute continuous agitation and then for 10 seconds each minute. Wash for 15 to 30 minutes with running water and a final rinse with Amaloco wetting agent for about a minute. No squeegee or finger swiping, I hang up the film to to dry immediately.
I like the tonality and character of this film a lot, otherwise I would have given up after two films.
I then tried again with freshly made fixer. My tank, reels, cups etc. were all cleaned extra well beforehand. I also switched from a Paterson tank to a Jobo. I mix the developer using one A and one B marked 5 ml syringe. Solution A is stirred in the water first and then solution B is added. No inter contamination of the developer occurred. Same result, thousands of specks.
My next film I did the same as above, but now I used demineralised water in the last wash, together with the wetting agent. Yet again, thousands of tiny black spots. I took to demi water because some of these spots look like there is a minute particle on the negative, followed by a small trail of residue. May have been something in the water.
Then I tried the same procedure, but with Rodinal 1+50 at 20 degrees C. Even more black spots appeared on the negatives. Development in XTOL 1:1 at 20 degrees, no pre-soak, stopping in Ilfostop, fixing in Ilford rapid fixer and washing and rinsing with regular running water gave me less black spots. But they were still there.
Then I took some Ilford FP4+ in 4x5 sheets, exposed at ISO 64 and developed these in BTZS tubes for 8 minutes in Pyrocat-HD 1+1+100 at 20 degrees C (no pre-soak). Washing and rinsing in regular running water and Amaloco wetting agent in the last stage. The only difference was, like with the XTOL, that I stoppped the development process with Ilfostop (1 minute) instead of using water and no pre-soak. Result: no specks at all, perfectly clean negatives.
What causes this? The water stop bath, the pre-soak or a bad batch of Foma film?
It is not the developer, since Pyrocat-HD performed admirably with Ilford film and I get black spots with Rodinal and XTOL too. It is not the fixer that was freshly made and left no marks on the Ilford film, neither is it the wetting agent. It is not the tank or the reels, since I switched between Paterson and Jobo a few times and all were clean. Kodak Tri-X or Fujifilm in XTOL, ATM49 or Rodinal in the same tanks etc. comes out just fine. The demineralised water did not help, even though I only used it in the last stage.
Thanks, Maurits
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