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

And one of my key interests in this, though not stated in the first
message, is the following. Is there any advantage to doing the acid
pre-soak in oxalic acid, if later developing in potassium oxalate,
and in citric acid if later developing in ammonium or sodium citrate?

Sandy

>From: Eric Neilsen <e.neilsen@worldnet.att.net>
>Subject: RE: Pt./Pd. question acid pre-soak
>Date: Tue, 09 Aug 2005 00:24:16 -0500
>
>> It is really a question of," Why does oxalic acid promote a higher
>> Dmax for PT/PD prints?" In what conditions? For both FO and AFO, RH
>> factor, Paper type?
>
>That's your question and not Sandy's or my question. Sandy's question
>was whether the pH change was the sufficient condition to improve the
>print, or something other than pH change given by oxalic acid is
>necessary. To test this, I suggested to avoid organic di- or
>polycarboxylic acids for comparison because the results are
>uninterpretable.
Received on Tue Aug 9 10:20:14 2005