Chemical replenishment question

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Jim Hutchison - 30 Jun 2004 09:11 GMT

I'm using Ilford chemicals, and am wondering when I should replace the
stop bath and fixer solutions... they've been recycled about 6 or 7
times now. I use Ilfosol, so that gets ditched each time, but I'm not
sure about the others...

Thanks in advance.

(BTW - this is an enjoyable NG.)
jim h

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Robert Feinman - 30 Jun 2004 14:31 GMT

> I'm using Ilford chemicals, and am wondering when I should replace the
> stop bath and fixer solutions... they've been recycled about 6 or 7
> times now. I use Ilfosol, so that gets ditched each time, but I'm not
> sure about the others...

If you are concerned about the stop bath get an indicator stop bath
and it will change color when it needs to be replaced.
Fixer capacity is listed on most of the packages. Probably about
25 rolls per liter is safe. You can test by fixing a piece of
undeveloped film (use the leader you cut off when you load the film
into the tank). When it takes twice as long to clear as fresh fixer
replace it.

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Robert D Feinman
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