[pure-silver] Re: stopbath kills fixer
- From: Ryuji Suzuki <rs@xxxxxxxxxxxxxxx>
- To: pure-silver@xxxxxxxxxxxxx, gkoch02@xxxxxxxxxx
- Date: Tue, 25 Jan 2005 15:04:57 -0500 (EST)
From: "Koch, Gerald" <gkoch02@xxxxxxxxxx>
Subject: [pure-silver] Re: stopbath kills fixer
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
I strongly discourage use of an alum hardening fixer that does not
contain borate. Without borate the useful pH window of potassium alum
is very narrow and they form sediment as the pH rises.
--
Ryuji Suzuki
"Keep a good head and always carry a light camera."
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