[pure-silver] Re: stopbath kills fixer
- From: "Koch, Gerald" <gkoch02@xxxxxxxxxx>
- To: "'pure-silver@xxxxxxxxxxxxx'" <pure-silver@xxxxxxxxxxxxx>
- Date: Tue, 25 Jan 2005 15:00:39 -0500
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
-----Original Message-----
From: pure-silver-bounce@xxxxxxxxxxxxx =
[mailto:pure-silver-bounce@xxxxxxxxxxxxx]
On Behalf Of John Black
Sent: Tuesday, January 25, 2005 1:39 PM
To: pure-silver@xxxxxxxxxxxxx
Subject: [pure-silver] Re: stopbath kills fixer
> The problem is that if the developer is not washed out of the=20
> emulsion it will continue to work once it gets into the alkaline=20
> envirionment of the fixing bath. I don't know of any specific =
research=20
> on this as a practical problem, it may not be, but its at least true=20
> on principle
This may be true in theory for concentrated developers but with diluted =
and/or
developers low pH developers (Xtol, DS-10 etc) the development is =
slowed to an
insignificant rate because the alk fix is only about pH 7.0-7.3 where =
most all
developers are almost inactive.
Your contention would be true if the fix was pH 8.5-9.5 but they are =
not. I
have been using a neutral to slightly alkaline fix with no stop bath =
now for
several years with no ill effects. My main reason for dropping the =
acid stop
and fix was twofold: first to minimize the pH shock to the emulsion =
during
development and second, I dislike acetic acid fumes as I got from the =
fixer
(were/are there any acid fixes using citric acid?).
JB
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