Re: EDTA

Thanks for the answers, Sandy and Linas and Eric--Eric, yours came as an
attachment so I immediately deleted it; could you repost as RTF?
I will not mix them in the same container. Interesting that the tetra
doesn't work as well...would adding citric acid do the trick? And if so, how
much?
Chris
----- Original Message -----
From: "Linas Kudzma" <lkudzma@earthlink.net>
To: <alt-photo-process-l@sask.usask.ca>
Sent: Sunday, May 02, 2004 10:02 AM
Subject: RE: EDTA

> Chris,
> EDTA is ethylenediaminetetraacetic acid. The tetrasodium form has all four
> acetic acid groups of the molecule neutralized to the sodium salt. The
> disodium has two neutralized and two acidic groups per molecule. They are
> not the same and the pH of the respective solutions are different as Sandy
> pointed out. I use a solution of ETDA Disodium as a clearing agent for
> Pd/Pt, and it works VERY well. A solution of EDTA Tetrasodium alone,
> without some acidic additive, is not as good a clearing agent for Pd/Pt.
>
> Linas
>
>
> > [Original Message]
> > From: Christina Z. Anderson <zphoto@bellsouth.net>
> > To: Alt List <alt-photo-process-l@sask.usask.ca>
> > Date: 5/1/2004 5:56:38 PM
> > Subject: EDTA
> >
> > Cleaning darkroom time!
> >
> > I have EDTA Tetra and then EDTA Disodium; are they interchangeable
and/or
> > can I mix them in one container?
> > Chris
> >
>
>
>
>
Received on Sun May 2 19:40:52 2004