[pure-silver] Re: Sodium Bisulfite

On 25/10/2007, Richard Knoppow <dickburk@xxxxxxxxxxxxx> wrote:
>
>
>
>     I found another non-hardening acid fixer formula, this
> one is from Agfa/Ansco
>
> Agfa 203 Non Hardening Fixer Stock Solution
>
> Sodium thiosulfate, crystalline                    475.0
> grams
> Potassium metabisulfite                             67.5
> grams
> Water to make                                        1.0
> liter
>
> For use dilute one part stock with one part water.
>
>      The amount of water to start with is not specified but
> is probably at least 500 ml. If crystalline hypo is used the
> water should be pretty hot, at least 125F. The metabisulfite
> is added after the thiosulfate solution has cooled.
>      This formula can also be made up using anhydrous
> thiosulfate, the amount being 64% of the above. If the
> anhydrous form is used the water should not be over 90F.
>      Sodium metabisulfite should work as well as the
> potassium salt. Agfa was able to obtain potassium salts very
> cheaply as a byproduct of their chemical manufacturing
> operations so they tended to specify them in their formulas.
>

     Thanks Richard, I really appreciate the effort.

     I think I'll give this one a stab and report back to you.

     J




-- 
Justin F. Knotzke
jknotzke@xxxxxxxxxx
http://www.shampoo.ca

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