[LargeFormat] Photoflo & Jobo 3000 Series Expert Drums

[Skip Roessel]

Clive,

Perhaps you could make up your own Rollo Pyro, from the published recipe
(Darkroom Cookbook):

    Part A

        Distilled water                        750ml
        Sodium Bisufite                        20 grams
        Metol                                          20 grams
        Pyrogallic acid                        150 grams
        Ascorbic Acid
            (Vitamin C crystals)                10 grams
        Potassium bromide                     1.5 grams
        EDTA tetrasodium                        2 -- 5 grams
        Add distilled water to make      one liter

    Part  B

        Distilled water                            900 ml.
        Sodium Metaborate                    300 grams
        EDTA tetrasodium                        5 grams
        Distilled water to make one liter

Working solution for an expert drum with 4- 8x10 films:
10 ml part A, 20 ml part B into 500ml water, (530ml total volume)
        at 68F/20C in Jobo drum, continuous rotation 25 rpm:

        FP4 at ISO 100            6.0 minutes
        HP5+ @ ISO 400        6.5 mins.
        BPF 200 @ 200           6.0 mins.
        T-Max 100                    6.5 mins.


The EDTA is a restrainer.  All these compounds are available from Photochem in
Quebec, Canada if not closer.  His website:
http://www.colba.net/~fotochem/index.htm

Although it's quite a project to secure a scale and mix one's own chemistry,
it pays off very quickly.  Especially if one starts doing things like gold
toner....
Skip
skiproessel@mindspring.com



Clive Warren wrote:

> At 10:02 10/12/2002 -0800, Jim Brick wrote:
> >Here's the answer to your question on Photoflo (stabilizer):
> >
> >http://www.jobo-usa.com/faq/stabilizer_on_reels.htm
> >
> >And you might want to read the article by Chuck Farmer:
> >
> >http://www.jobo-usa.com/jq/jq9502.htm
>
> Hello Jim,
>
> That's great, thank you very much for the URLs. Tells me all I need to know
> and the Chuck Farmer article is excellent as I was beginning to wonder
> about how to use pyro in the Jobo without the advantage of access to
> rollo-pyro here in the UK.
>
> Once the expert drums arrive here I'll be a happy man.
>
> Cheers,
>              Clive
>
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