[pure-silver] Re: stopbath kills fixer
- From: Ryuji Suzuki <rs@xxxxxxxxxxxxxxx>
- To: pure-silver@xxxxxxxxxxxxx
- Date: Tue, 25 Jan 2005 15:18:44 -0500 (EST)
From: "John Black" <jblack@xxxxxxxxx>
Subject: [pure-silver] Re: stopbath kills fixer
Date: Tue, 25 Jan 2005 13:38:34 -0500
> 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.
One should not forget that fixer environment has a lot higher level of
silver activity. pH is only one factor in development. Practically
speaking the risk of dichroic fog is the largest denger when developer
is carried over to the fixing bath. Good water rinse is adequate. If
rapid arresting of development is necessary, the stop bath has to be
buffered and fairly strong in terms of titratable acid. Ordinary 1.5%
acetic acid (or any similar scid) stop bath is slow in arresting
development.
> I dislike acetic acid fumes as I got from the fixer (were/are there
> any acid fixes using citric acid?).
See below.
From: "John Black" <jblack@xxxxxxxxx>
Subject: [pure-silver] Re: stopbath kills fixer
Date: Tue, 25 Jan 2005 14:37:24 -0500
> My fixer as well, is only about pH 7.0-7.3 but the old style acid fix was
> fairly low (pH 4.0-4.5 or so). But all of the acid fix formulas used acetic
> acid and I didn't like the smell either.
Those smells are more likely that of sulfur dioxide not acetic
acid. But maybe both. I'd use acetate or glycolic acid or whatever and
buffer the pH around 5 to 5.5 and see if that still smells.
--
Ryuji Suzuki
"Keep a good head and always carry a light camera."
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