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Thread: Pyrocat-HD

  1. #11
    Ian Grant's Avatar
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    Quote Originally Posted by Matus Kalisky View Post
    I LOVE the negatives the Pyrocat HD can produce, but have a few standing issues.

    1) Film speed - I seem to loose between 1/3 - 2/3 stops (depends on the film). OK, this is a minor point

    2) Uneaven development. Often when developing 120 films in a Jobo tank I would get streaks running across the film (or along the axis of the drum) on a few frames (not all !) - even with agitation every minute. Scanning works great indeed, but if one needs stronger adjustments to contrast in PP (that forbidden digital part) - the uneven development really starts to show.

    I am wondering whether my problem No. 2 is because the Pyrocat HD (in Glycol) I have is around 7 years old (yeah, I still did not finis those 0.5l bottles). I use it in 1:1:100 dilution and should definitely have enough developer for the film area.

    I never get the above problems with Xtol.
    I get better films speed with Pyrocat HD than with Xtol or ID-11/D76 (to achieve a similar tonal range. I shoot HP5 & Delta 100/400 at box speed.

    I process in a Jobo tank mostly 5x4 sheet film but also some 120 as well with no issuesbut mine's an inversion tank.

    Ian

  2. #12

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    Quote Originally Posted by K-G View Post
    Thank you , Ed Bray and Curt . Yes , I have thought of mixing my own magic brew , but finding a supplier of raw chemicals in small amounts and to private persons seems to be as difficult here as I have understood it is in most other countries. I will continue trying and see what I can succeed with.

    Karl-Gustaf
    Karl-Gustav,
    You can get Pyrocat-HD form me if you want. I mix and sell the glycol version regularly and other versions if needed. Sorry that my website http://hopeavedos.fi is only in Finnish but you can contact me in Swedish or English. It should not be a problem to send from Finland to Sweden, I have don it even before.

    Olli

  3. #13

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    What surprised me about the instructions for Pyrocat-HD in glycol (as per http://www.pyrocat-hd.com/html/mixing.html) is the suggestion that the KBr and metabisulfite is introduced into the glycol as a solution in water - I'd have assumed that this would defeat the object of using glycol, which is to keep water out of the stock solution, isn't it?

    Perhaps Ian or Gerald or similarly chymical gentleman could fill me in on why it seems to be OK in this case?

  4. #14
    Ian Grant's Avatar
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    Quote Originally Posted by pdeeh View Post
    What surprised me about the instructions for Pyrocat-HD in glycol (as per http://www.pyrocat-hd.com/html/mixing.html) is the suggestion that the KBr and metabisulfite is introduced into the glycol as a solution in water - I'd have assumed that this would defeat the object of using glycol, which is to keep water out of the stock solution, isn't it?

    Perhaps Ian or Gerald or similarly chymical gentleman could fill me in on why it seems to be OK in this case?
    They won't dissolve in Glycol so must be dissolved in water, a little water won't affect the keeping properties. It's important to use fresh Metabisulphite as it's the SO2 it releases that stops oxidation of the Pyrocatechin. Once the Metabisulphite breaks down the developer collapses.

    Oxygen is absorbed into water but not into Glycol which helps prevent oxidation. In practice with fresh Metabisulphite and the right bottles I have Pyrocat HD without Glycol that's lasted from March 2011 and is still OK today, so over 2½ years.

    Commercial developers made up in Glycol or similar need some water to dissolve some of the components.

    Ian

  5. #15
    Rick A's Avatar
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    Rick A
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  6. #16

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    Quote Originally Posted by pdeeh View Post
    What surprised me about the instructions for Pyrocat-HD in glycol (as per http://www.pyrocat-hd.com/html/mixing.html) is the suggestion that the KBr and metabisulfite is introduced into the glycol as a solution in water - I'd have assumed that this would defeat the object of using glycol, which is to keep water out of the stock solution, isn't it?

    Perhaps Ian or Gerald or similarly chymical gentleman could fill me in on why it seems to be OK in this case?
    And you can leave out the KBr unless you're doing an alternative process that requires the absolute minimum fog. There is a post somewhere from Sandy King to that effect. Maybe (just a guess on my part) this could entail the use of a little less water.

  7. #17
    Eric Rose's Avatar
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    Check out Sandy King's website: http://sandykingphotography.com
    www.ericrose.com
    yourbaddog.com

    "civility is not a sign of weakness" JFK

    "The Dude abides" - the Dude

  8. #18
    K-G
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    Thank you VaryaV for your comments on Moersch Finol. I may give it a try.
    Olli J I will send you a PM when I am about to make my next paper/film/chemicals order ( Sometime in January ).

    Happy New Year to all of you.

    Karl-Gustaf
    Karl-Gustaf Hellqvist

    www.heliochroma.com

  9. #19

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    I'm tempted to knock up a batch of Pyrocat-HD, just for the sake of my continuing to be inconsistent with developers, but I have only Sodium carbonate on hand for part B.

    According to http://www.pyrocat-hd.com/html/mixing.html, Part B can be made up with Sodium carbonate at 20% and the basic working solution proportion amended to 1:5:100.
    However I also saw Sandy King suggest here at APUG (http://www.apug.org/forums/viewpost.php?p=780237) that it should be a 15% solution (but still used at 1:5:100)

    I'm guessing this isn't terribly critical?

  10. #20
    Truzi's Avatar
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    Quote Originally Posted by pdeeh View Post
    I'm tempted to knock up a batch of Pyrocat-HD, just for the sake of my continuing to be inconsistent with developers, but I have only Sodium carbonate on hand for part B.

    According to http://www.pyrocat-hd.com/html/mixing.html, Part B can be made up with Sodium carbonate at 20% and the basic working solution proportion amended to 1:5:100.
    However I also saw Sandy King suggest here at APUG (http://www.apug.org/forums/viewpost.php?p=780237) that it should be a 15% solution (but still used at 1:5:100)

    I'm guessing this isn't terribly critical?
    Umm... does "knock up" mean the same thing where you are as it does in the States? (I understand, just having some fun.)

    I have some Pyrocat HD in glycol from the Formulary, but haven't used it yet. I'll try some on 120 before I start printing so I can see what everyone is talking about. I'll probably try it in a couple weeks.
    Truzi

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