[pure-silver] Re: stopbath kills fixer
- From: "Koch, Gerald" <gkoch02@xxxxxxxxxx>
- To: "'pure-silver@xxxxxxxxxxxxx'" <pure-silver@xxxxxxxxxxxxx>
- Date: Tue, 25 Jan 2005 16:12:18 -0500
I have never used this fixer but had the formula in my collection of formulas.
The amount of citric acid should give it a pH similar to acetic acid fixers
containing ~15 ml of glacial acetic acid per liter. I would guess the pH would
be in their range of 4.5 to 5.5.
-----Original Message-----
From: pure-silver-bounce@xxxxxxxxxxxxx [mailto:pure-silver-bounce@xxxxxxxxxxxxx]
On Behalf Of John Black
Sent: Tuesday, January 25, 2005 3:18 PM
To: pure-silver@xxxxxxxxxxxxx
Subject: [pure-silver] Re: stopbath kills fixer
> Citric Acid Fixer
>
> Water (50=B0C) ........................... 600 ml
> Sodium thiosulfate (pent) .............. 240 g=20
> Sodium sulfite (anhy) .................. 15.0 g=20
> Citric acid ............................ 5.0 g=20
> Potassium alum ......................... 15.0 g=20
> Water to make .......................... 1.0 l=20
>
> Preparation
>
> Dissolve the thiosulfate in the indicated amount of water. In 80 ml
> of = water, dissolve the remaining ingredients and add to the
> thiosulfate solution = with
> rapid stirring. Make up to the solution to 1 liter.
>
> Use full strength. Fix for 5 to 10 minutes.
>
> You can leave out the alum if you don't desire hardening.
>
> Jerry
Thank you. Do you have any idea of the target pH?
JB
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