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Thread: Developing tank advice

  1. #41

    Re: Developing tank advice

    Quote Originally Posted by j.e.simmons View Post
    Thinking about that, esearing may be right. I’ve developed hundreds of EMA negatives without bromide drag, but I’m using Pyrocat P and M which do not have the KBr.
    Yes, that does seem reasonable. The worst bromide drag I ever saw was with Semistand development of very old Plus-X sheet film from the 1970s. This disappeared entirely when I used D-23 instead of Pyrocat-HD.

    Are the results otherwise different with Pyrocat P/M viz. HD?
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  2. #42

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    Re: Developing tank advice

    I use the same times as I used with HD and donít see any significant difference.

    I use Kodak tanks and regular hangers.

  3. #43

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    Re: Developing tank advice

    I mostly use the SP-445, and occasionally BTZS tubes.

  4. #44
    Tin Can's Avatar
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    Re: Developing tank advice

    I use those clips for drying only

    I worry about contact in the tanks, as it flops about

    Quote Originally Posted by tundra View Post
    I use hangers of this kind and a 1/2 gal Kodak rubber tank: https://i.ebayimg.com/images/g/mN4AA...jmU/s-l300.jpg

    You can also use X-Ray film clips but you have to figure out a way to suspend them.

  5. #45

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    Re: Developing tank advice

    Quote Originally Posted by otto.f View Post
    +1 too. I have an extra pair of slides so I could do 8 films in two runs with 1 litre solution in total, but I mostly come home with 4 sheets. To be sure to keep it dry when agitating, I put a piece of gaffer tape over the lid, which is closing ok, but still.
    I was going to get a second set of slides, but realized the SP-445 slides are so easy to dry this isn't necessary, you can just shake them off, wipe with a suitable cloth and they are ready to reload without issues. [FWIW, I find the SP+445 so much easier to use than the Jobo reel, I'd rather do 2 runs with the SP-445 to develop 6 sheets than use the reel. But I wish there was an 8 sheet version of the SP tank to speed things up.]

  6. #46

    Re: Developing tank advice

    Quote Originally Posted by Tin Can View Post
    I use those clips for drying only

    I worry about contact in the tanks, as it flops about
    I've run into that myself, but the fix is to pick a tank large enough for the number of sheets in question. for 1-4 sheets (my most usual case) I use a 1/2 gal rubber tank. For more than that, something like a 1 gal Tupperware tub of appropriate shape/size is the better choice.

    Bear in mind that with semistand, there is only the initial 2 min agitation and one other at midpoint, so there is not a lot of film motion during the development cycle. That said, I HAVE had to learn to be careful when using these clips after a number of unfortunate instances of scratching.

    More to the point, with Pyrocat-HD at least, these are the only clips that reliably avoided bromide drag. The frame style hangers were a disaster. I am looking forward to mixing some Pcat without KBr to see if that is more forgiving.
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  7. #47
    Tin Can's Avatar
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    Re: Developing tank advice

    Perhaps I will try those clips top and bottom with weights

    I run gas burst

    Quote Originally Posted by tundra View Post
    I've run into that myself, but the fix is to pick a tank large enough for the number of sheets in question. for 1-4 sheets (my most usual case) I use a 1/2 gal rubber tank. For more than that, something like a 1 gal Tupperware tub of appropriate shape/size is the better choice.

    Bear in mind that with semistand, there is only the initial 2 min agitation and one other at midpoint, so there is not a lot of film motion during the development cycle. That said, I HAVE had to learn to be careful when using these clips after a number of unfortunate instances of scratching.

    More to the point, with Pyrocat-HD at least, these are the only clips that reliably avoided bromide drag. The frame style hangers were a disaster. I am looking forward to mixing some Pcat without KBr to see if that is more forgiving.

  8. #48

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    Re: Developing tank advice

    Here's one of mine. No laughing!Click image for larger version. 

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  9. #49

    Re: Developing tank advice

    Quote Originally Posted by Tin Can View Post
    Perhaps I will try those clips top and bottom with weights

    I run gas burst

    Ideally, if I can get one of the Pyrocat variants without KBr to work to suit, I can hopefully go back to standard hangar frames. These protect the film from scratching and abrasion better than anything else and are much easier to work with than the pinch hangers. We'll see.
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  10. #50

    Re: Developing tank advice

    Quote Originally Posted by Tin Can View Post
    Perhaps I will try those clips top and bottom with weights

    I run gas burst
    OK so, to followup on this... Yesterday I mixed up a batch of Pyrocat-M and processed two sheets of exposed film using the Kodak frame hangers to suspend them in a 1/2 gal Kodak rubber tank.

    There are still definitely development byproducts visible along the edge of the film that was at the bottom of the tank. IOW, even removing the KBr from the developer does not fully solve the low agitation development artifact problem.

    It's worth noting that I Semistand developed this for an hour with an initial 2min of agitation and one midpoint agitation. I suspect that had I done EMA, this would not have been an issue.

    I think the term "bromide drag" really refers to all byproducts of the development process not just those attributable to the KBr in solution.

    I therefore will continue to use pinch/minimal contact support for all my low agitation development.

    As an aside, it was hard to come up with a canonical formula from Pyrocat-M. Some formulae call for 25g of Metol/liter (!) and some just 2.5g/l. Sandy King's original article called for 10 parts Metol for every part of the Phenidone it is replacing, which would put it at 20g/l. I went with 2.5g/l and got solid negatives a full film speed with Agfapan APX 100 sheet film. I'd love to know why there is such variability in the formula though ....
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