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  1. #1

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    Pyrocat HD Sheet Capacities

    I just started using the metol version of Pyrocat with Na Carbonate, 20:100:940. Can anyone quote 4x5 sheet capacities for this or the original formula.

  2. #2

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    Quote Originally Posted by waynecrider
    I just started using the metol version of Pyrocat with Na Carbonate, 20:100:940. Can anyone quote 4x5 sheet capacities for this or the original formula.
    I use 435 ml for an 8x10 sheet in the 2:3:100 concentration, so conceivably you could use 110 ml per 4x5 sheet. If I were you I would go with at least 200 ml per 4x5 sheet to avoid exhaustion and/or streaking.

  3. #3
    jmdavis's Avatar
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    Jorge,

    Do you use the 435ml/sheet of 8x10 with tubes?

    Thanks,

    Mike

  4. #4

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    Quote Originally Posted by Jorge
    I use 435 ml for an 8x10 sheet in the 2:3:100 concentration.
    Why 2:3:100?
    Technological society has succeeded in multiplying the opportunities for pleasure, but it has great difficulty in generating joy. Pope Paul VI

    So, I think the "greats" were true to their visions, once their visions no longer sucked. Ralph Barker 12/2004

  5. #5

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    Yes Jim, I use the JancC tubes, they are great and a a bargain.

    Mark, I use 2:3:100 instead of 2:2:100 because I want a little bit more activity with the developer.

  6. #6

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    At 1.5:1.5:100, 3ml each of concentrate s A and B in 200ml solution developed a 10x8 sheet quite happily. I was messing about during early tests, but all seemed well. I now use 4.5Ml each A and B in 300ml total solution for a 10x8 in a paterson orbital. This makes me feel comfortable, but I will prob go back to 200ml. I did notice that the less solution, the more oxidised the dev is on emptying - quite a bit difference. Negs were indistinguisghable tho.. In an accidentally overexposed sheet, I had loads of density so clearly no shortage of chems.

    BTW I upped the 1:1:100 for silver printing as I like to work close to 20 degs C as 24 degs is to far from ambient in the UK and as orbitals use evry little dev, the solutions drops temp considerably and inconsistently depending upon ambient, so 20 ddegs seemed a better option. I am still using times of about 12-15 mins tho, so may go to 2:2:100 just to cut time down more.
    Tom

  7. #7
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    It's all in the articles on unblinkingeye: http://unblinkingeye.com/Articles/Pyrocat/pyrocat.html

    At 1:1:100 75ml are needed per sheet 4x5 developing in a rotary-processor which can be considered to be the hardest condition the developer will ever encounter.

    Stefan

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    I wonder if there is any difference in the amount of solution needed when developing in a deep tank as I do, compared to a rotary processor or when using tubes?

  9. #9
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    Reading some of these posts makes me wonder if I had enough developer in my tanks the other day. I was using 500 mL of 2:2:200 for 2 sheets of 8x10 in a Jobo. I think the negs are okay.
    Diane

    Halak 41

  10. #10
    skahde's Avatar
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    Diane, in a deep tank you will have much less aerial oxidation which pretty much limits the developers life in a rotary-processor. Even when considering rotary-processing 500ml at 2:2:200 equals to just 20% less stock solution than recommended in the article referenced above and shouldn't cause any trouble.

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