Re: Pyro.

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From: Sil Horwitz (silh@earthlink.net)
Date: 09/26/00-09:07:19 PM Z

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At 2000/09/26 08:25 PM -0700, Cecil wrote:
>Please, can someone tell me what is the difference between Sodium
>Bisulfite and Sodium Metabisulfite?Iam about to make a batch of pyro which
>calls for the former, but I can only find the latter. What should I do?

For alt photo purposes, the two compounds can be used in exactly the same
way. There is even confusion when photo suppliers label the stuff. In fact,
most of the bisulfite on the market is actually the metabisulfite. So
(according to the Merck Index) "for all practical purposes the
metabisulfite possesses the same properties as the true bisulfite."
Interchangeable.

<<sil>>
<silh@psa-photo.org>
<webmaster@psa-photo.org>
Sil Horwitz, FPSA
Technical Editor, PSA Journal
check out <http://www.psa-photo.org>
personal page: http://home.earthlink.net/~silh/

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