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  Photography Forum: Darkroom Techniques Forum: 
  Q. Longevity of Chemicals
Jon O
Asked by Jon O'Brien    (K=11321) on 11/1/2005 

I haven't had much chance to do any dark room work in the last few months. Consequently I have some chemicals that are about 8 months old (concentrates, not made up) - fixer, stop bath and print developer. I assume that the chemicals I mixed prior to now are toast, but what is the shelf life of the concentrates (all ilford, stored in the dark).

Thanks in advance,


Jon


    


 ann clancy   (K=2014) - Comment Date 11/1/2005
Ilford fixer in it's stock form should be good.

If i understand your verbiage the stop bath which is in it's stock condition is still good.

The developer if opened may or may not be useable. It depends on many variables.

The chemicals that have been mixed are probably not usable, especially the developer. Just test the fixer and find out.





Jon O
 Jon O'Brien   (K=11321) - Comment Date 11/1/2005

Thanks, Ann - I appreciate your response. How do I test the fixer?


Jon




 ann clancy   (K=2014) - Comment Date 11/1/2005
You can get some Hypo check. place a drop or two in the fixer and if it gets cloudy (the drops) the fixer is exhastued.




 Simon Scott   (K=136) - Comment Date 11/1/2005
Jon,

you could check your fixer by using old film leaders, this is the quickest test I use when testing chemicals in the darkroom that I teach.

If they don't go clear after 2 minutes then ditch the Fixer.

Stop Bath will be purple when its exhausted, developer - if your not sure then don't compromise

cheers Simon



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