From: Sil Horwitz (silh@earthlink.net)
Date: 09/27/00-11:38:20 AM Z
At 2000/09/27 08:57 AM -0700, Jack Fulton wrote: (in part)
>The meta-bisulfite is used as an alkali in photo developers, to hinder or
>avoid creation of gas when it comes in contact w/an acid and that lowers the
>possibility of blister formation during your processing of film.
Sodium metabisulfite is very definitely acidic, not an alkali, and has been
used as a preservative in 2 and 3 part pyro developers, as any solution
that is neutral (ph 7) or more alkaline will accellerate the oxidation of pyro
Sil Horwitz, FPSA
Technical Editor, PSA Journal
teched@psa-photo.org
silh@earthlink.net
Visit http://www.psa-photo.org/
Personal page: http://home.earthlink.net/~silh/
This archive was generated by hypermail 2b29 : 10/01/00-12:09:00 PM Z CDT