Potassium Alum is the traditional one for Sodium fixers. Here is
the old GAF 201 hardening fixer formulation.
Solution 1
Water @ 52ºC 500ml
Sodium Thiosulfate 240g
Solution 2
Water @ 52ºC 150ml
Sodium Sulfite, dessicated 15g
Acetic acid (28%) 45ml
Potassium Alum 15g
Add solution 2 to solution 1 with enough water to make 1 liter.
Use undiluted.
Normal fixing times are 5 to 10 mminutes.
William Robb
----- Original Message -----
From: "Sid Barras" <[EMAIL PROTECTED]>
To: <[EMAIL PROTECTED]>
Sent: Monday, January 15, 2001 10:27 PM
Subject: OT: what chemical is the "hardener" in fixer?
> Hi all,
> I retrieved several bottles of Sodium Thiosulfate out of a
school's
> trash bin (another story).
> I want to make up some home made batches of fixer.
> So, what's that hardener made out of?
> Thanks, guys.
>
> SId
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