[pure-silver] Re: sulfite in PMK working solution
- From: Sandy King <sanking@xxxxxxxxxxx>
- To: pure-silver@xxxxxxxxxxxxx
- Date: Wed, 29 Dec 2004 18:07:24 -0500
Ryuji,
Thank you very much for providing the various conversion rates, and
for your best assumption about what was in the original PMK formula.
Sandy
>
>That is, (2 x 126)g of sodium sulfite and 190g of sodium metabisulfite
>make same number of sulfite ions (dissociated molecules) when they are
>fully dissolved and the pH adjusted. Similarly, 1.33g of sodium
>sulfite and 1.00g sodium metabisulfite make equal amount of sulfite
>ions.
>
>> I would also conclude that it is probably not possible to know at
>> this point exactly what Hutchings used in the original formulation,
>> i.e. 1) pure sodium bisulfite, 2) a mixture of bisulfite and
>> metabisulfite, or 3) pure metabisulfite sold as bisulfite?
>
>I would also agree, but if I had to make one best assumption, I'd pick
>3. Also note that the discrepancy is (only) 0.33.
>
>--
>Ryuji Suzuki
>"Keep a good head and always carry a light camera."
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