[alt-photo] Re: Question for Platinum/Palladium printers

[BOB KISS]

DEAR ETIENNE,
	While I believe in and have indulged in testing of my procedures I
also do not believe in reinventing the wheel.  Nadeau, Arentz and Neilsen
have all published books and/or statements recommending other acids, EDTA,
etc, and approved my steps.  I have had good results clearing with a first
bath of Ox Ac, then two baths of EDTA plus sulfite, then a final hypo clear.

	Further, all the above sources DO state that prints that are either
mostly or purely PD are more susceptible to bleaching by HCL so they state
that, if one must use it, use a 1/2% instead of 1% soln.  
	From my perspective, if it ain't broke, why fix it?  
	I am happy that your procedures work for you and am even happier to
read and consider the results of your experiences...that is why I love
list...but until I see a problem with clearing, I will proceed with my
system.
	Thanks!
		HOLIDAY CHEERS!
			BOB

-----Original Message-----
From: alt-photo-process-list-bounces at lists.altphotolist.org
[mailto:alt-photo-process-list-bounces at lists.altphotolist.org] On Behalf Of
etienne garbaux
Sent: Saturday, December 31, 2011 1:55 PM
To: The alternative photographic processes mailing list
Subject: [alt-photo] Re: Question for Platinum/Palladium printers

Bob wrote:

>Though I am not qualified to determine the verity of the following
>statement, many books and other sources on pt/pd printing allege that using
>an HCL first clearing bath can bleach some of the subtle highlights in
>(mostly or pure) palladium prints.
>Is there someone on this list sufficiently versed in chemistry and
>experienced in pt/pd printing to either confirm or deny this allegation
once
>and for all?
>It has been around for a long time and should either be confirmed or
>buried.

Channeling Judy for a moment:  JUST TRY IT, if you want to know, 
instead of expecting someone to feed you the answer to every 
question.  Even this list is no substitute for doing one's own 
testing.  And that is a dead easy test to run.

I have experienced nothing of the sort -- but then, I have always 
used pure Pt. I doubt it would have any effect on Pd, either, if 
everything else was done properly (paper pre-treatment, sizing, 
coating, drying, re-humidifying, developing, and rinsing).  Judging 
by the colors, I have to assume that a fair number of my antique "Pt" 
prints are actually Pd, and there is no subtlety lacking in their 
highlights -- which would appear to support my speculation.  But, 
again, I have not done any testing with Pd.

Best regards,

etienne






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