[pure-silver] Re: Measuring low levels of silver in fixer
- From: "Ralph W. Lambrecht" <info@xxxxxxxxxxxxxxxx>
- To: pure-silver@xxxxxxxxxxxxx
- Date: Wed, 3 Feb 2010 00:20:03 +0100
Peter
This is not a good sign. It sound like you need to change the habit of
leaving the fixer out open in the tray.
Regards
Ralph W. Lambrecht
http://www.darkroomagic.com
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On Feb 02, 2010, at 23:52, Peter Badcock wrote:
Hi Ralph,
I'm not sure, but the film clearing time is about 6 minutes (when
fresh it is about 30-50 seconds) and the silver content is <1g/L.
As I'm not a chemist I can't explain why this would be the case. It
is an Ilford Rapid fix and from memory the pH was around 4-5 as
displayed on the same tetenal test strip.
I'm waiting to hear back from my water authority re. my proposed
methods of dealing with my spent fixer. I'll keep you posted.
rgds
Peter
On 2 February 2010 04:34, Ralph W. Lambrecht <info@xxxxxxxxxxxxxxxx>
wrote:
Peter
I forgot to add that the reason I wouldn't necessarily do as Ralph
suggested and use test strip to determine 1g/L then dilute to 50ppm
is that I often leave my fixer out in a tray in my sink and the
clearing time reaches unacceptably high values before the silver
concentration will even reach 1g/L
Why would that be?
Regards
Ralph W. Lambrecht
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