RE: Oxalic Acid for Pt./Pd.

Sandy,

Yes adding oxalic acid to the FO solution has been suggested most notably by
David Kennedy and the late John Rudiak. If you have a copy of "The New
Platinum Print" refer to the 'Notes from the field' section on page 78.
According to that section an increase in speed should be expected with the
addition of oxalic acid to the FO solution but there is no mention of
increased DMAX.

Also if you check Rudiak's web page he lists a developer formula that uses
oxalic acid as an ingredient.

I may be wrong about this but I believe I've read somewhere about printers
who have brushed on or first coated the paper with a solution of oxalic acid
before coating with the standard palladium solution.

I've not tried any of these methods.

Don

> -----Original Message-----
> From: Sandy King [mailto:sanking@clemson.edu]
> Sent: Wednesday, September 15, 2004 12:02 PM
> To: alt-photo-process-l@sask.usask.ca
> Subject: Oxalic Acid for Pt./Pd.
>
> I get higher Dmax by about 0.10 - 0.20 with most papers in Pt/Pd.
> printing by first soaking in a 1% solution of oxalic acid, then
> drying without rinsing.
>
> Soaking papers this way is not terribly inconvenient, but I am
> wondering if anyone has experimented with adding oxalic acid directly
> to the sensitizer before coating?
>
> Sandy King
>
>
Received on Wed Sep 15 10:21:49 2004