[pure-silver] Re: Adding Pot Bromife to PC-TEA
- From: "Koch, Gerald" <gkoch02@xxxxxxxxxx>
- To: "'pure-silver@xxxxxxxxxxxxx'" <pure-silver@xxxxxxxxxxxxx>
- Date: Tue, 4 Jan 2005 10:18:33 -0500
I made some prints last night from the negatives developed in a modified version
of the Gainer developer mentioned in yesterday's post. Fog is nil, contrast is
just what I wish, and the grain is very fine. I use a 1:1 mixture of propylene
glycol and TEA as the solvent for the concentrate.
Jerry
-----Original Message-----
From: pure-silver-bounce@xxxxxxxxxxxxx [mailto:pure-silver-bounce@xxxxxxxxxxxxx]
On Behalf Of John Black
Sent: Monday, January 03, 2005 5:10 PM
To: pure-silver@xxxxxxxxxxxxx
Subject: [pure-silver] Re: Adding Pot Bromife to PC-TEA
> Ideally, I would start with a carefully formulated developer to avoid
> all these issues. What is the aim of dealing with a developer with
> troubles like this?
>
> I'd not even consider ammonium salt in a fine grain developer.
> Tertiary amines like triethanolamine is a way to control the solvent
> effect of ammonium ion. If KBr doesn't work, I would look into
> 6-nitrobenzimidazole or 1-phenyl-5-mercaptotetrazole. The latter is
> used in quantity like 2-20mg per liter of working solution anyway.
> --
> Ryuji Suzuki
Or, use a modest boric acid solution, say 5-10gm/L of water as diluent to lower
the pH and anti-fog is not needed. An equal amount of sulfite may be necessary
to restore PC activity. PC/TEA diluted 1:50 in water as Gainer suggests has a
pH of greater than 9.0 and that's where the fog comes from.
JB
> "Keep a good head and always carry a light camera."
>
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