[pure-silver] Re: sulfite in PMK working solution

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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