[pure-silver] Re: Chemical subsitution
----- Original Message ----- From: "BOB KISS" <bobkiss@xxxxxxxxxxxxx> 
To: <pure-silver@xxxxxxxxxxxxx>
Sent: Friday, April 27, 2007 5:56 AM
Subject: [pure-silver] Re: Chemical subsitution



DEAR RICHARD,
Well, as we say in Barbados, now I con-FUSED! In your e-mail below (was that your info or Doug Nishimura's info?) where it states that Hypo Clear is mostly sulfite and metabisulfite, it also states that, "Kodak has added a small amount of sodium citrate and tetra-sodium EDTA to bind-up unwanted metal ions effectively". Hmmmmmmmmm, is Doug wrong in his assessment that there is sodium citrate in hypo clear instead of the citric 
acid that you cited from the patent info?  Please advise.

           CHEERS!

                 BOB

    I am not sure where I got this originally but I found

this searching rec.photo.darkroom using Google groups

search.


   The above is me speaking....
   The copies message from Doug Nishimura starts here:
-----------------------------------------------------------------------


Hypo clearing agent is mainly a mixture of sodium sulfite

and sodium

metabisulfite. The metabisulfite behaves very much like

sodium bisulfite (as the

Merck index says, "The bisulfite of commerce consists
fixer and Kodak Fixer are a similar pair.




-Doug

Douglas Nishimura

Research Scientist

Image Permanence Institute


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  And ends here with his signature.
  Most of message snipped...
---
Richard Knoppow
Los Angeles, CA, USA
dickburk@xxxxxxxxxxxxx 
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