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Stop bath / Washing B&W film in a drum


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Please allow me two questions:

1. I realised from other postings that when using a rotary drum to

wash the film (8x10 Unidrum in my case for Agfapan 100) you must use

approx 400ml of fresh water changing several times. Is there any

indication as to the duration of each cycle and the number of times

that the water should be changed ?

 

2. I intend to use 15g citric acid in a liter of water as a stop bath

for Agfapan 100. Are there suggestions for the duration of this step

in an 8x10 Unidrum ?

Thanks

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I use a jobo drum. When I'm feeling lazy I'll stick the hose that came with the drum and leave it running for five minutes. Normally I'll just do an Ilford wash setup. Yup it takes a lot of water to fill the tank but at this point I'd rather waste a little water then my negatives.

 

If you're going to use little water [i guess on a motorbase?] I'd still do it similar to the ilford system. Say four or five changes. 30 seconds. The number of changes are likely more important then the time. More water changes are okay. Too few won't work.

 

For the second question I'd just use the same time you would use outside of the drum. Nothing really different between the drum and anything else when it comes to stop bath.

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1. Jobo recommend 10 changes of water with 30 seconds rotation each

(note this is not 30 seconds in the drum, but 30 seonds rotation).

 

2. I am not sure citric is safe to use, from memory acetic is one of

only a few acids which do not cause the fixer to decompose. I would

just use a water rinse instead of a stop bath.

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