[pure-silver] Re: I say Ammonium you say Potassium
- From: Howard Efner <hfefner@xxxxxxxxxxxxx>
- To: pure-silver@xxxxxxxxxxxxx
- Date: Tue, 21 Aug 2007 12:51:41 -0600
According to the CRC handbook, 42nd Ed., Nelson Gold oner (Kodak
T-21) uses potassium persulfate in stock solution A. 4.0 L warm
(125F) water, 960.0 g sodium thiosulfate, and 120.0 g potassium
persulfate. Dissolve hypo completly before adding the posassium
persulfate. Stir vigorously while adding the persulfate. If the
bath does not turn milky, increase the temperature until it does.
Cool and then add (including the precipitate) the following
solution with rapid stirring. Cold water 64 mL, silver chloride 5.0
g, sodium chloride 5.0 g.
Ammonium and potassium persulfate should be interchangeable as long
as you adjust the weights allowing for the different formula weights
of ammonium persulfate and potassium persulfate. There is that old
high school or freshman chemistry again.
Howard
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