RE: EDTA

Chris, My reply only went to Linas so when I noticed that it hadn't posted
to the group, I resent it from sent mail.

It said...

I have mixed some together for clearing of platinum prints, and as Linas
said, they do have different ph. Which is why I like to use straight Di
sodium first, a mix for my second and a Tetra sodium for my third clearing
bath as it has a pH that reacts less with the buffering agents in some
papers.

Eric Neilsen Photography
4101 Commerce Street
Suite 9
Dallas, TX 75226
http://e.neilsen.home.att.net
http://ericneilsenphotography.com

Eric Neilsen Photography
4101 Commerce Street
Suite 9
Dallas, TX 75226
http://e.neilsen.home.att.net
http://ericneilsenphotography.com
 

> -----Original Message-----
> From: Christina Z. Anderson [mailto:zphoto@bellsouth.net]
> Sent: Sunday, May 02, 2004 8:38 PM
> To: Alt List
> Subject: 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 20:43:49 2004