RE: Potassium Oxalate developer for Platinum printing

Jeffrey, the UV suggestion came from me; that is step one. Step two is to
filter it out.

Eric Neilsen Photography
4101 Commerce Street
Suite 9
Dallas, TX 75226
http://e.neilsen.home.att.net
http://ericneilsenphotography.com
 
> -----Original Message-----
> From: Jeffrey D. Mathias [mailto:jeffrey.d.mathias@att.net]
> Sent: Wednesday, April 26, 2006 7:09 AM
> To: alt-photo-process-l@usask.ca
> Subject: Re: Potassium Oxalate developer for Platinum printing
>
> As to Core Breukel stating "Jeffrey Mathias advices to use the developer
> single shot, reusing will cause fog."
>
> This is an absolute and does work. However, in practice the important
> thing is to replenish periodically, keep acidic, and replace when a
> little fogging becomes noticed. It is definitely not good to keep any
> used PO for longer than a couple years even if kept dark and cool (test
> and find out.)
>
> One must keep in mind that anything that goes into the PO may stay there
> and end up on, in or affecting a subsequent print. The largest concern
> of mine is actually contamination by contrast agents.
>
> Someone mentioned exposure to UV light of the solution. I believe this
> may not be good as the fine metal which results may cling to the paper
> fibers and not clear as readily as the unexposed metal salts, resulting
> in fog. I suspect that the fog from old PO is from subsequent metal from
> the washed off unexposed coating. A good amount of the unused coating is
> cleared in the PO, even with short times.
>
> --
> Jeffrey D. Mathias
> http://home.att.net/~jeffrey.d.mathias/
Received on Wed Apr 26 09:14:44 2006