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Old 13th September 2012, 08:58 AM
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GoodOldNorm GoodOldNorm is offline
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Default Old Fixer as Stop Bath?

Just purchased my first bottles of Prescysol, the instructions say use water for the stop bath. Is there any reason not to use exhausted alkaline fix as a stop bath to prevent developer contaminating my fresh fixer?
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Old 13th September 2012, 09:58 AM
Richard Gould Richard Gould is offline
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If you use water as a stop then you should have so little carry over that you should not have any problems. use 3 baths of water, invert 15 ton 20 inversion, pour water out and repeat twice more, I use this system with D76 without problems, as far as using exhausted fixer as a stop bath, remember that even though the fixer is exhausted as far as fixing film it will not be completely exhausted, and will still be able to contament your developer much more than using a water stop bath
Richard
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Old 13th September 2012, 03:18 PM
Mike O'Pray Mike O'Pray is offline
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Richard I think your fingers like mine at times move faster than your brain What were you trying to say when you use the word contament in your last sentence and does this back up Norm's idea?

It may be that Norm is wondering if exhausted fix can act as an immediate stop as stop does but water doesn't(allegedly) without introducing any acidity which Peter Hogan recommends against as subjecting the film to a change in the form of acid which he regards as too harsh. Hence his recommendation to continue in an alkaline regime by using an alkaline fixer.

An interesting use of exhausted fix as a stop bath substitute, if of course it works. Does it?

Mike

Mike

Presumably Norm is using Peter Hogan recommnedationsuing
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Old 13th September 2012, 04:10 PM
Richard Gould Richard Gould is offline
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Should have got the old brain in gear today, I still believe that old exhausted fixer will have enough in it to CONTAMINATE the film developer and I would stick with a water stop bath,which is I believe, what Peter Hogan suggests, remember as I said earlier, even when exhausted for fixing film it will still have some action left, sorry about the spelling error, but sometimes these computers have a mind of their own.
Richard
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Old 13th September 2012, 05:00 PM
peterlg peterlg is offline
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I've wondered about Norm's question: why not use used fixer as stop, it sounds a good idea to me.
Then, Richard, I don't see how it could contaminate the developer?? when I come to the stop bath, the developer has been dumped??
Peter
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Old 13th September 2012, 05:02 PM
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To clarify my question.To keep the whole process alkaline I thought it would be a good idea to use prescysol developer then straight into exhausted alkaline fix then fresh fix to eliminate the water stop bath (my water leaves scum marks on film when its dry if I do not do the final rinse in wetting agent/dist. water). Would any developer residue left in the old fix do any harm and would old fix work as a stop bath?
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Old 13th September 2012, 05:14 PM
Richard Gould Richard Gould is offline
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I do not know Prescysol developer, is it a one shot type ? if so then I do not see any reason not to use water, and I would still be inclined to follow Peter Hogans suggestion, there are 2 ways to anwser the question, one is to try it the other would be to ask Peter Hogan, send him an Email and get the definative answer from the horse's mouth, which is what I would do.
Richard
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Old 13th September 2012, 05:21 PM
Richard Gould Richard Gould is offline
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Norm, Fixer would certainly work as a stop bath, when I get to the last use of mixed fixer I leave the stop and just put the fixer in, so that answer's that part of the question, but what the effect of any developer residue in the fixer would be I don't know, when the film is stopped all the developer should be neutralised, so there shouldn't be any residue in the fixer, other than that all I can say is try it and see,
Richard
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Old 13th September 2012, 05:39 PM
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Quote:
Originally Posted by Richard Gould View Post
Norm, Fixer would certainly work as a stop bath, when I get to the last use of mixed fixer I leave the stop and just put the fixer in, so that answer's that part of the question, but what the effect of any developer residue in the fixer would be I don't know, when the film is stopped all the developer should be neutralised, so there shouldn't be any residue in the fixer, other than that all I can say is try it and see,
Richard
Richard I just read on another site that there may be a problem with residual silver salts in the exhausted fixer causing fog. So I will use filtered water as a stop bath and stop trying to think of ways to use old fixer. Im sure I read somewhere that old fixer diluted makes a good fertiliser
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Old 13th September 2012, 06:01 PM
Richard Gould Richard Gould is offline
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Quote:
Originally Posted by GoodOldNorm View Post
Richard I just read on another site that there may be a problem with residual silver salts in the exhausted fixer causing fog. So I will use filtered water as a stop bath and stop trying to think of ways to use old fixer. Im sure I read somewhere that old fixer diluted makes a good fertiliser
Norm,
Glad that is all sorted, My old fixer gets used as a loo cleaner, works a treat,
Richard
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