[pure-silver] Re: Sodium Carbonate to print developer
From: "Koch, Gerald" <gkoch02@xxxxxxxxxx>
To: <pure-silver@xxxxxxxxxxxxx>
Date: Wed, 3 May 2006 10:15:06 -0400
Adding more sodium carbonate to working strength MQ print developers
will shift image tone toward cooler tones. This is due to the increase
in pH. More effective is potassium carbonate. Older books on printing
recommended replacing the sodium carbonate with trisodium phosphate w/w.
However, this can cause problems with hardening fixers. These formula
changes are said to give improved blacks. I don't think you will see
much difference with PQ developers. If you only wish to cool the image
tone then adding benzotrizole to the developer is a more effective
method.
Jerry
-----Original Message-----
From: pure-silver-bounce@xxxxxxxxxxxxx
[mailto:pure-silver-bounce@xxxxxxxxxxxxx] On Behalf Of Steve Nicholls
Sent: Thursday, May 04, 2006 12:30 AM
To: pure-silver@xxxxxxxxxxxxx
Subject: [pure-silver] Sodium Carbonate to print developer
What if any effect can be gained by adding more Sodium Carbonate to a
standard print developer such as Dektol or Bromophen?
If there is a change in print tone do you have any suggested additions
to a litre of working strength developer??
Steve
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