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Thread: what is the capacity of pyro cat HD

  1. #1
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    what is the capacity of pyro cat HD

    At a 1:1:100 ratio. How many sheets of 8x10 per liter?
    Paul Ward

    First real camera: Nikon F2, gift from gandfather (1980), still have and use it.
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    Agfa 8x10 Field Camera

    “A big negative is really a positive…”

  2. #2

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    Re: what is the capacity of pyro cat HD

    The recommendation is 250 ml / 8x10 sheet, but I regularly use 200 ml / sheet and it works just fine.

  3. #3

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    Re: what is the capacity of pyro cat HD

    I don't know what 250ml means, but I routinely process 6 sheets of 4x5 in a 1300ml tank. I use hangers. Dilutions are 1:1:100
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    Eric Rose
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  4. #4
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    Re: what is the capacity of pyro cat HD

    K thanks. I normally process 4 sheets 8x10 in one liter so I guess I'm ok
    Paul Ward

    First real camera: Nikon F2, gift from gandfather (1980), still have and use it.
    Wista m45 4x5
    Calumet Green Monster
    Agfa 8x10 Field Camera

    “A big negative is really a positive…”

  5. #5

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    Re: what is the capacity of pyro cat HD

    My personal testing and process recommendations (time and temperature) were based on rotary processing using about 60 ml of the 1+1+100 dilution per sheet of 4X5 film, or 250 ml per sheet of 8X10. The absolute minimum is less than 60 ml of 1+1+100 per sheet of 4X5 film, but if you use less the developer will exhaust faster, and there will be more oxidation which can increase base+fog stain. This is not necessarily a bad thing but it will change the results of my recommendations. A stronger dilution will make the developer more energetic, and the solution will take longer to exhaust, with less oxidation. All things considered I found that the optimum dilution for rotary processing was abouy 60 ml of the 1+1+100 working solution per sheet of 4X5 film.

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  6. #6

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    Re: what is the capacity of pyro cat HD

    Quote Originally Posted by Eric Rose View Post
    I don't know what 250ml means, but I routinely process 6 sheets of 4x5 in a 1300ml tank. I use hangers. Dilutions are 1:1:100
    4 sheets of 8x10 per liter of 1:1:100 is the standard. That is 16 sheets of 4x5 IF done at the same time. Trying to do 4 or 6 or 8 sheets of 4x5, and then repeat inthe same developer leads to underdevelopment at best. the developer oxidizes as used and thus loses strength.

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