From: Sandy King (sanking@hubcap.clemson.edu)
Date: 04/23/00-06:18:26 AM Z
For what it is worth,
1. Most of the research indicates that ammonium thiosulfate fixers
are superior to those formulated with sodium thiosulfate.
2. For developing maximum stain with PMK and other staining
developers an alkaline fixer is superior to an acidic one. The
difference in maximum stain between the two types of fixers is not
great, and for practical considerations may be unimportant.
Nontheless, alkaline fixers produce slightly more stain than acidic
ones.
Try the TF-3 Alkaline fixer formula in The Film Developing Cookbook.
Stock Solution
Ammonium thiosulfate 57-60% 800ml
Sodium sulfite anhydrous 50g
Sodium metaborate 20g
Water to make 1 liter
For Working Solution, Dilute 1:4 with water.
Sandy King
>Since the chrysotype workshop w/ Mike Ware is happening about 20 miles
>from home... I figured I better not pass it up. So now I have taken on
>learning how to use PMK Pryo developer to have some negatives before
>the August workshop. For my first time, I ordered some of the
>Photographers Formulary packaged developer. After reading the
>instructions, It calls for a non-acidic fixer and recommends using
>their TF-4 fixer, which of course I don't have. Does anyone experienced
>with Pryo know why I can't just use Sodium Thiosulphate and mix it two
>pounds to one gallon of water as in the Darkroom Cookbook
>instructions??? Should I perhaps add anything else? Your suggestions
>are very welcome right about now! Thanks,
>garimo
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