Re: PT/PD MOGULS, MAESTROS & GURUS
Thanks, John, for saving me time locating my source; you are exactly
correct.
Eric, since you have hydrochloric acid (alas I was wrong, I only have
sulfuric, nitric, and phosphoric) and since pt/pd is your process of choice,
why don't you do a step wedge of each and tell us what you find? BTW, John,
I checked Neblette's 4th edition and I can't find the Nadeau source there,
even though there is a chapter on pt/pd. Neblette quotes Clerc and a couple
others, tho.
But Bob, back to your original question--do you even have HCL and can you
see if a dilute mix will do what you need it to do? Isn't HCL that pool
chemical stuff that one could get at a hardware store?
Chris
----- Original Message -----
From: "John Roseborough" <platinumprinter@msn.com>
To: <alt-photo-process-l@usask.ca>
Sent: Tuesday, February 13, 2007 11:59 AM
Subject: Re: PT/PD MOGULS, MAESTROS & GURUS
Eric,
In "The History and Practice of Platinum Printing" by Luis Nadeau (2nd
edition) page 32, Nadeau states that HCl is to be used highly diluted to
1% - 1.5% for Platinum and 0.5% for Palladium.
John Roseborough
----- Original Message -----
From: "Eric Neilsen" <ejnphoto@sbcglobal.net>
To: <alt-photo-process-l@usask.ca>
Sent: Tuesday, February 13, 2007 8:46 AM
Subject: RE: PT/PD MOGULS, MAESTROS & GURUS
Chris, WHERE is that note taken from?
Eric Neilsen Photography
4101 Commerce Street
Suite 9
Dallas, TX 75226
http://e.neilsen.home.att.net
http://ericneilsenphotography.com
Skype ejprinter
-----Original Message-----
From: Christina Z. Anderson [mailto:zphoto@montana.net]
Sent: Tuesday, February 13, 2007 8:43 AM
To: alt-photo-process-l@usask.ca
Subject: Re: PT/PD MOGULS, MAESTROS & GURUS
Bob,
Even tho I have hydrochloric acid I have never used it to reduce a
print.
My notes say "palladium is more soluble in strong acids, so if you use
hydrochloric acid, the traditional clearing bath, your dilution of that
clearing bath is 0.5%, not 1% as it is with platinum." I, too, am
interested
if this is wrong? And I wonder if it will work when using
NA2/palladium...hmmm...I have a too dark print, maybe I should just go
do
it.
Chris
> DEAR PT/PD MOGULS, MAESTROS & GURUS ON THIS LIST,
> Please help me resolve what appears to be a conflict in both the
> literature and common wisdom.
> Here are the two conflicting bits of info:
> 1) You must not use a hydrochloric first clearing bath when printing
with
> palladium as it will bleach the print, even though the concentration
> should
> be around 1 to 1.5 %.
> 2) Recently, when I asked the list if there was any way to slightly
reduce
> the density of a Palladium print I was told that the concentration of
HCl
> necessary to have any effect would be so high that it would be
> dangerous
> to
> use in a regular darkroom and might have deleterious effects on the
paper.
> I was told to just make another, lighter print.
> *********So, you can see my dilemma. Is this not a contradiction?
> 'Tis
a
> puzzlement! Please enlighten me...as it were!
> CHEERS!> BOB
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