RE: Pt./Pd. question acid pre-soak

Clay, I missed this post yesterday. That was a 2% citric acid bath for
several minutes? Have you just taken the Fabriano and soaked it in
distilled water as a pre treatment. Have you checked the pH of the acid bath
after? How do you determine how many sheets you can treat?

Eric Neilsen Photography
4101 Commerce Street
Suite 9
Dallas, TX 75226
http://e.neilsen.home.att.net
http://ericneilsenphotography.com
 
> -----Original Message-----
> From: Clay [mailto:wcharmon@wt.net]
> Sent: Tuesday, August 09, 2005 5:36 AM
> To: alt-photo-process-l@sask.usask.ca
> Subject: Re: Pt./Pd. question acid pre-soak
>
>
> I accidentally pre-treated Fabriano Extra White in citric instead of
> oxalic acid right before a workshop about a year ago. Everything
> seemed to print the same. I did not do any rigorous comparison
> between the prints treated with oxalic and the prints treated with
> citric, but the difference was certainly unnoticeable to the casual
> observer, and probably to a print sniffer as well.
>
> YMMV
>
> clay
>
>
>
> On Aug 8, 2005, at 7:37 PM, Sandy King wrote:
>
>
>
> > As we know a pre-soak in a 1-2% solution of oxalic acid can add
> > quite a bit of Dmax in Pt./Pd. printing with some papers. Does
> > anyone know the mechanism of how this works? Is it merely a
> > question of acidifying the paper? Has anyone ever compared the
> > results between papers pre-soaked in oxalic acid and in some other
> > dilute acid solution, say a 1-2% solution of citric acid?
> >
> >
> >
> >
> > Sandy
> >
Received on Fri Aug 12 08:10:06 2005