Search results for query: presoak

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  1. Photo Engineer

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    Where would film technology be now?

    Presoak works. It gets rid of air bubbles and improves uniformity. I use it all the time with my Jobo and I have done probably thousands of rolls of 120, 220 and 35mm as well as 4x5. I did not use it at Kodak but I did have Nitrogen burst there which was quite strong, and so a prewet was not...
  2. Photo Engineer

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    Where would film technology be now?

    A presoak with any film or color paper is quite beneficial. PE
  3. Photo Engineer

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    Arista C41 Rotary: Dumb Question for Jobo

    I use a 1 minute presoak for ALL C41 processing. PE
  4. Photo Engineer

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    Looooong Pre-soak

    Well, in any event this proves that a presoak does no damage! :D PE
  5. Photo Engineer

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    "Pre-Wet"- Rinse after Development - Importance Of Plain Water

    The point is that many who presoak get streaks because they do it improperly, not because it is a bad idea!!! PE
  6. Photo Engineer

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    (Unicolor C-41 kit) Are my negatives coming out right?

    Extended presoak can affect the film due to contaminants in city water. A brief presoak of 1' or less is just fine. PE
  7. Photo Engineer

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    (Unicolor C-41 kit) Are my negatives coming out right?

    ...but can be corrected in Photoshop. Then it shows crossover meaning some sort of bad processing. Without some sort of pre-tempering (I use presoak) the mass of the processing tank and reel outweigh the mass of the developer and the temp drops by as much as 3 deg C. This could be the...
  8. Photo Engineer

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    Pre-rinse or no pre-rinse

    I use the same process times with and without presoak! Yes, there were scientific studies. Yes, Kodak has printed recommendations to use a presoak on film. Yes, I have published this on APUG before. AAAAAAAAAAAAAAAAgh! I'm getting tired of this. The wave front effect I mentioned earlier...
  9. Photo Engineer

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    Pre-rinse or no pre-rinse

    I have observed problems with the Jobo or other rotary processors used without presoak, and this covers over 50 years of processing film. With a presoak, the problems vanish for the most part (there can be more than one problem). Jobo recommends it and there is good reason. But, if you plan...
  10. Photo Engineer

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    Which Current Black and White Films have Incorporated Development Accelerants?

    I use a Jobo, I use hard rubber tanks, and I use regular SS tanks for my films. I tray process plates. I presoak everything to prevent unevenness and pinholes due to air bubbles. PE
  11. Photo Engineer

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    Which Current Black and White Films have Incorporated Development Accelerants?

    I presoak everything, color and B&W, and use normal development in my Jobo. Modern accelerants are generally polymers or are ballasted, and will not wash out of a film. Ilford apparently uses a surfactant in their films which aids in development. I use a prewet anyhow. It works just...
  12. Photo Engineer

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    benefits of c41 at lower temp?

    Use a 1' presoak, but not more than about 2' at 100F. For those who insist on using a bogus process at lower temperatures, use a presoak at the same temp you are going to use. If Kodak could have designed C41 quality into a lower temp process, they would have done it and saved all of the...
  13. Photo Engineer

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    benefits of c41 at lower temp?

    There was a demo posted here about the benefits of a presoak which does a better job of prewarming the tank before development begins. I refer you to that. Presumably, this benefit would be present in all cases but would decrease as process temperature goes down. The benefit of a prewet in...
  14. Photo Engineer

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    Pre-soak

    ...the coating operation. They act like photo flo added to the film. Also, some lubricants added to film to help coating will cause a similar problem. I see it in a presoak with some films, and tests without a presoak reveal the same problem in the developer. This can cause non-uniformity. PE
  15. Photo Engineer

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    Pre-soak

    Kodak recommended a presoak for Pan Matrix Film before entering the tanning developer. Sheets of film sticking together would certainly be a real problem. I don't tray develop sheet film, I use film hangers in hard rubber tanks. Thus my sheets are separated by the metal hangers. PE
  16. Photo Engineer

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    Developing C-41 film (Jobo?) tips/advice/etc

    Tom; AFAIK, a presoak does nothing to Kodak film one way or another. It does benefit from the POV of pinholes and from poor air tempering before starting development. Read the other thread for real data. I have been using a presoak for over 30 years with no observable harm. I learned to do...
  17. Photo Engineer

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    Effects of presoaking on E-6 film

    Actually, to be clear on this, I believe that the bigger the tank and the more film present, the more 100F short presoaks should be used. This is to prevent chilling of the presoak water by large masses of tank and film. So 200 ml 2x for 30" each might be good for 1 - 4 rolls on up to 2 or 4...
  18. Photo Engineer

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    Effects of presoaking on E-6 film

    ...of the fingers bent or the lid very slightly off, or the cap slightly off. This can be so tiny, you cant find it but water can. :( As for presoak, there is an excellent test posted here somewhere that shows better temperature in the tank with a presoak which is critical with 100F...
  19. Photo Engineer

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    C-41/E-6 processing with my Jobo ATL-2300 processor

    Rotating an empty tank in a warm water bath gets you a warm tank and "cold" film! You need the presoak! At least 2 of them even though one is better than none! I've said that over and over and most people ignore or dispute the results, but you have the data that proves it. And, BTW, you can...
  20. Photo Engineer

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    Artifact: What's the cause?

    If you are doing C41 or E6 this is reasonable. Also at that high temp, the drop in the first presoak is bad enough to need a second one. So, I use 2 30" presoaks at 100F and 1 presoak at 68F. Reasonable? PE
  21. Photo Engineer

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    Artifact: What's the cause?

    Randy; I suspect that some people give a long presoak and that might lead to problems. I suggest a 1 minute or less presoak. I use at least 2 changes of water at 100F and only 1 at 68F. PE
  22. Photo Engineer

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    Confirmation reg Fomapan 100

    The carbonate only becomes a problem at an acid pH. A presoak will not allow closing of small holes. It will swell the emulsion and help prevent air bubbles from forming. PE
  23. Photo Engineer

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    New batch of paper emulsion -- it gets better!

    Tim; Congratulations. Here are some thoughts. Presoak the starch before adding it to the emulsion. That will help. The effect you describe is probably due to extreme hardness. IDK for sure, but mine do not behave that way. It could be the sizing in the paper itself which is somewhat of a...
  24. Photo Engineer

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    Diluting C-41 Developer: Is there any way to do it?

    Dan; I've used a water presoak for years (20+) for uniformity with no problem, but in the labs for test purposes I used no presoak. I have actually found no significant difference. I have found that the presoak reduces air bubbles on the surface of film. I also find that the temperature...
  25. Photo Engineer

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    Strange, large dots with Kodak Plus-X and Kodak XTOL 1+1

    See my earlier post on presoak. Kodak has recommended it since the 40s to promote more even development. PE
  26. Photo Engineer

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    Strange, large dots with Kodak Plus-X and Kodak XTOL 1+1

    Dear all; From the earliest manuals, Kodak has suggested using a presoak. I have just looked up my first developing book published by Kodak in the 40s and there it is with a photo of the film going into a presoak. I have used one for years, and it really does improve things in drum...
  27. Photo Engineer

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    first c41 roll processed! wow! stab problem

    The presoak color is the absorber or acutance dye(s) added to the film to increase sharpness and trim speed. PE
  28. Photo Engineer

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    C-41 is blowing my top....

    The process that I posted here for C-41 is Presoak Develop Bleach Wash Fix Wash Stabilze Dry Use of a wash at 100F for C41 after the developer will cause overdevelopment of the cyan layer on the bottom and will thereby lead to some crossover and color balance shifts. It is not...
  29. Photo Engineer

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    Extending Fix Times

    Dan; Your last paragraph is the most fundamental and telling comment of all regarding fixation and this is why I recommend testing. However, your first part is indicative of conditions so at variance with most everyone else that it skews both your fixation and wash conditions badly from...
  30. Photo Engineer

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    Colored pinholes in my slides

    ...but when you have colored pinholes it can indicate a coating defect. One of the layers is missing. The reason I san "can" is that you might have a transient air bubble in either developer, and when it bursts it then allows partial development. Did you give it a good presoak? PE
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