[LargeFormat] Photoflo & Jobo 3000 Series Expert Drums
Skip Roessel
largeformat@f32.net
Thu Dec 12 12:08:08 2002
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
>
> _______________________________________________
> LargeFormat mailing list
> LargeFormat@f32.net
> http://www.pairlist.net/mailman/listinfo/largeformat