Re: Modifying PMK for Rotary use?

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From: Tox Gunn (tox@remarque.org)
Date: 01/09/01-10:51:58 PM Z

Thanks. I also forgot about the bromide in the ABC+.
Hm.
Pondering soemthing along the lines of 3:2:100 PMK
plus 0.10g Ascorbic and 0.025g EDTA.
Hm.

If I find an answer, I'll post it to the list,
suspect there might be some value to a "C" solution
for PMK that would bring it to "Rollo-imposter"..;)

If I run short on time and test sheets, I may jsut
go buy the Rollo kit.

Thanks,
Tox
> Tox wrote:
>
> >It looks like I should be able to goose one
> >of my PMK kits with some EDTA and Ascorbic
> >and get something *close* to the Rollo
> >formulation. Since I can't effectively reduce
> >the amount of bisulfite in the PMK concentrate,
> >does anyone have suggestions on how much of
> >each I should add? I'm assuming that if I
> >use the levels from the Rollo formula with
> >that much bisulfite in the mix that I'm likely
> >to dissolve/complex part of the image.
>
> You will have to do the figuring yourself to soup up your PMKmix but here
> is what PMK and Rollo Pyro (ABC+) have in a liter of working solution.
>
> PMK (1:1:100 dilution)
> Pyrogallol 1.0g
> Metol 0.1g
> Sulfite 0.2g
> Sodium metaborate 6.0g
>
> Rollo Pyro (2:4:100)
> Pyrogallol 3.0g
> Metol 0.2g
> Sulfite 0.2g
> Ascorbic acid 0.1g
> Sodium metaborate 12.0g
> Potassium bromide 0.015g
> EDTA 0.025g
>
> Sulfite is the same in both formulas so that is not a problem. I am not
> sure what would happen if you just added ascorbic acid. I suspect that it
> would make the developer a lot more active but it *might* also reduce stain
> if the amount of pyrogallol is not also increased. EDTA will not add any
> energy to the developer
> >
>
> Instead of trying to soup it up you might just consider adding about a
> pinch of sodium sulfite (dry) to each liter of working solution. That will
> reduce oxidation and cut down on the heavy general stain/fog you get with
> plain PMK in rotart processing. Your develpment times will be a little long
> to get to the right density range for Pt./Pd. printing but that will give
> you an opportunity to watch the Jobo in action and see your money at work.
>
> Sandy King
>
>

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