Given that the one situation most seem to agree upon is the value of pre-wetting sheet film when tray developing, an emulsion side uu versus down discussion would be quite appropriate. What did Ansel do? What does DREW do?
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Maybe it's time for a new thread with a new debate. Do you tray develop sheet film emulsion up or down? I'm strictly of the emulsion-up persuasion in order to avoid air bell haloes. But this could also apply as a relevant factor in unevenness of development, and hence be one more consideration in the prewet or don't prewet contest itself. One has to factor all of their own personal development protocol variables.
Given that the one situation most seem to agree upon is the value of pre-wetting sheet film when tray developing, an emulsion side uu versus down discussion would be quite appropriate. What did Ansel do? What does DREW do?
Given that the one situation most seem to agree upon is the value of pre-wetting sheet film when tray developing, an emulsion...
And like many prescription medicine bottles, "For oral use only"... as if one would do otherwise.
And like many prescription medicine bottles, "For oral use only"... as if one would do otherwise.
Unless it's a suppository???
Black & white film prewashing was scientifically, controlled and rationally addressed at length by PE. I suggest you do some research and read PE's work.
I have high regard for the many comments left over the years by PE before he left us. I'm not aware of his comments on pre-washing B&W film for development, and I think I'll decline our suggestion that I seek them out. I doubt he'd take exception to my limited observations on the subject, particularly that most of the commentary on the subject here and elsewhere is uninformed nonsense. If you personally disagree with any of the points I raised, I'd be happy to hear your argument and expand on my reasoning if necessary.
I'm not aware of his comments on pre-washing B&W film for development
Presoaking the film before development will help eliminate this problem as will tapping the edge of the tank as you pour the developer or prewet water into it..
The bottom line is that the prewet improves uniformity and helps eliminate streaking.
I presoak everything to prevent unevenness and pinholes due to air bubbles.
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.
A presoak with any film or color paper is quite beneficial.
Just a few quotes of PE talking about a pre-soak, in most instances it's in a context of B&W processing, but he's quite explicit here and there on pre-soaking all of his film when processing using a Jobo, also on why he did this and some of the physics involved.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.
So, PE basically said, those who pre-soak don't necessarily need to feel guilty of pretending to know better than Ilford and Kodak engineers?
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