From: Sandy King (sanking@clemson.edu)
Date: 08/05/03-03:52:14 PM Z
Manuel,
>
>You wrote once the following about your miraculous Pyrocat-HD :
>
>"My testing with Pyrocat-HD is based on 6ml of working solution per 20
>square inches of film, so an 8x10 sheet of film needs a minimum of about
>500ml of working solution."
>
>
>My question is :
>
>If you use the Jobo expert drum for processing that means that you
>should use 2500ml of solution to develop five 8x10 sheets ? That seems
>unrealistic in terms of drum capacity and processor motor.
>What volume do you advise for developing 5 8x10 sheets in an Expert drum ?
You can reduce the quantity of developer to about 250ml per 8X10 film
with the 1:1:100 dilution, a little less with the 2:2:100 dilution.
That is conservative. I actually use only about 1 liter of solution
of the 2:2:100 dilution to develop a sheet of 20X24" Ilford FP4+.
>I'm getting some mottling mainly in sky areas, as that inconvenient law of
>nature determines, with BPF 200 at 2:2:100, 500ml volume ,speed "P". Can
>this problem be related with the developer volume I'm using ?
My advice is to change films. I too have encountered mottling in sky
areas with BPF with Rollo Pyro as well as Pyrocat-HD. There is
absolutely no reason I know of that the developer itself should cause
mottling withe the volume per film area and the the agitation method
you describe.
Sandy
>
>
>Thanks in advance for your always rewarding and useful support you give to
>us all . :-)
>
>Kindest regards
>
>Manuel
>Punctum Studios
>Portugal
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