[pure-silver] Re: fixer question - wash water xchg rate
- From: eroustom@xxxxxxxxxxx
- To: pure-silver@xxxxxxxxxxxxx
- Date: Tue, 03 Jun 2008 21:27:35 +0000
What rate of water exchange is sufficient for good washing?
Elias
-------------- Original message ----------------------
From: Charlie Thorsten <charlie_thorsten@xxxxxxxxx>
> --- On Mon, 6/2/08, Sissy Albertine <salbert@xxxxxxx> wrote:
>
> >Hi all,
> >I am printing on Ilford Multigrade FB paper and noticed the directions
> >>state
> that it should be fixed in Ilford Paper Fixer (1 + 3) for 1 minute >with
> intermittent agitation. Being old school, I find it hard to believe >fiber
> base
> can be archivally fixed in 1 minute. Am I off here?
> >Thanks,
> >Sissy Albertine
>
> Ilford did a lot of research into how to achieve shorter
> washing times, mainly because much of England tries to
> conserve water and a 1-2 hour wash was prohibitive. They
> found that a 1 minute fix in FRESH rapid fixer (ammonium
> thiosulfate), mixed 1:4, with CONSTANT agitation allows
> complete fixing of the emulsion without too much fixer
> penetrating the paper base. This allows a washing time
> of 30 minutes, or a 5min wash/10min HypoClear/5min wash
> cycle (See Ilford fact sheet "Processing B&W FB Paper":
> http://www.ilfordphoto.com/Webfiles/200621111117720.pdf)
>
> This works only if you follow the rules exactly. The print
> must be fixed vigorously for precisely one minute. Any
> longer and fixer will saturate the paper base, negating
> any short wash advantage. Second, the rapid fixer bath
> (ammonium thiosulfate) must be FRESH. Ilford specifies a
> capacity of only 10 8x10's per liter of working solution.
> Remember this includes all test strips, work prints, etc.
>
> It definitely works if this is followed precisely, but it's
> easy to mess up. Two bath fixing followed by a longer wash
> (one hour) is far more reliable and more forgiving. It
> mainly depends if you're trying to save water or not. The
> "old school" way is not wrong by any means.
>
> -Charlie
>
>
>
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