[pure-silver] Re: stopbath kills fixer
- From: "Richard Knoppow" <dickburk@xxxxxxxxxxxxx>
- To: <pure-silver@xxxxxxxxxxxxx>
- Date: Mon, 24 Jan 2005 20:19:46 -0800
----- Original Message -----
From: "J.R. Stewart" <jrstewart@xxxxxxxxxxxx>
To: <pure-silver@xxxxxxxxxxxxx>
Sent: Monday, January 24, 2005 6:07 PM
Subject: [pure-silver] Re: stopbath kills fixer
> Ralph recently convinced me that an acid stop was
> important, even if using
> an alkaline fix routine on FB paper. So lately I've been
> giving prints a 30
> second acid stop followed by a 1 min fresh water rinse
> under agitation, then
> into the TF4 alkaline fix.
>
> Does this sound sufficient? Is 30 seconds enough time for
> the stop to
> neutralize the developer in the emulsion... sure seems
> like it ought to be
> but just wondering.
>
> J.R. Stewart
It should be. I am not sure about the necessity of
neutralizing what is in the paper support since it is being
washed out. I would suggest extending the water rinse to
about three minutes but that may be overkill if you don't
have problems in practice.
I don't see the necessity of adding an alkali to the
fixing bath. Hypo and sulfite should be sufficient. The hypo
doesn't care about pH. The sulfite will help to preserve the
hypo and to reduce or eliminate any problems from staining
from carried over developer. I think the main concern is
continued development in the fixer. This is likely less of a
problem for paper than film since paper is developed pretty
fully anyway and film is not.
Again, unless you are trying to preserve Pyro stain and
have discovered through practical application that the use
of an acid stop bath and acid fixer causes it to be lessened
I don't see any advantage to the use of alkaline or neutral
fixing baths. For paper I see none whatever since any
advantage in washing rate from non-harding fixer or alkaline
fixer can be overcome using a sulfite wash aid following a
conventional acid chain. The only advantages I can think of
for neutral fixing baths is that neutral or alkaline rapid
fixer does not bleach silver and that they tend to have much
less odor than the acid varity. Actully, if you don't
require the hardener an acid fixer can be made much less
acid and lower in odor.
---
Richard Knoppow
Los Angeles, CA, USA
dickburk@xxxxxxxxxxxxx
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