RE: sodium citrate, ammonium citrate, bleeding of borders

Chris, How old and seasoned are your developers? Staining will be very very
slight, if it happens at all, in a fresh developer but may start to be a
problem as the developer build up materials from previous prints; metal
salts, ferric, ferrous, and buffers, paper bits, etc.

And pH will change over the life of a developer if steps are not taken to
maintain it with both additional amounts of fresh
as well as addition of an appropriate acid.

Eric

Eric Neilsen Photography
4101 Commerce Street, Suite 9
Dallas, TX 75226
214-827-8301
http://ericneilsenphotography.com
 
Skype : ejprinter
> -----Original Message-----
> From: Christina Z. Anderson [mailto:zphoto@montana.net]
> Sent: Monday, July 24, 2006 10:23 AM
> To: alt-photo-process-l@usask.ca
> Subject: Re: sodium citrate, ammonium citrate, bleeding of
> borders
>
> Sandy,
> In what way does the acidity have a big impact on printing? In
> the way the
> print looks finally or in the way it processes? I think a while
> back you had
> said that you get staining if the developer does not stay acid
> but I am not
> seeing that happen.
>
> BTW, Sam also told me you've tested am and sod side by side and
> may know the
> speed/dif between the two. Does your result match mine--sod
> being a bit
> lower contrast, 1/4 stop slower maybe at most, and a bit
> yellower in tone?
> Chris
>
> >I use sodium citrate for printing kallitype, and sometime with
> > palladium (though for palladium I prefer potassium oxalate).
> What I
> > use is Trisodium Citrate, C6H5Na3O7, 258.07. When mixed with
> > distilled water the resulting pH is about 7.0. I bring this
> down to
> > about pH 6.0 by adding more citric acid to the mix, and this
> has a
> > big impact on printing.
>
>
> One could also add citric acid to an ammonium
> > citrate solution to reduce pH.
> >
> > In any event, I do agree that it would be best to test these
> two
> > solutions at the same pH to create a valid comparison in
> printing
> > characteristics, because pH does make a big difference, and
> you
> > especially want to avoid allowing the solutions to become
> slightly
> > base.
> >
> >
> > Sandy
> >
> >
> >
> >
> >
> >>Oh pooh, Roger! I threw away the jar. I knew I should've
> kept it.
> >>
> >>I got it from Tri-Ess when it was in business, but since they
> closed
> >>I threw away the catalog, too, so I can't even check back.
> But if
> >>someone has an old catalog of TriEss it would be in there. I
> know
> >>it was written on the label, anyway.
> >>I had no idea there were three types!
> >>Chris
> >>----- Original Message ----- From: "permadocument"
> <info@permadocument.be>
> >>To: <alt-photo-process-l@usask.ca>
> >>Sent: Monday, July 24, 2006 2:18 AM
> >>Subject: Re: sodium citrate, ammonium citrate, bleeding of
> borders
> >>
> >>>Dear Chris,
> >>>
> >>>Can you tell us what sodium citrate you used; monosodium
> (pH= 3,4-4,0),
> >>>disodium (pH=5,0) or trisodium (pH=7,5-9,0)?
> >>>Thanks,
> >>>Roger
> >>>
> >>>--
> >>>Roger Kockaerts
> >>>Permadocument - pH7
> >>>Rue des Balkans, 7
> >>>B-1180 Brussels
> >>>Tel.:32-2-347 66 76
> >>>Fax: 32-2-344 43 04
> >>>TVA: BE 0438 246 889
> >>>web page: <http://www.permadocument.be>
> >>>
> >
Received on 07/24/06-10:00:12 AM Z