Re: PT/PD Mogules, Maestros & Gurus

[John Roseborough <platinumprinter@msn.com>]

Eric and Moguls,

Yes he does.  C. B. Neblette, "Photography, Its Principles and Practice",
3rd Edition, P. 513. That edition I don't have because Neblette's 5th was
the text book I used at RIT. There is only a brief overview of the iron
processes in Neblette's 5th with no reference to reducing Palladium prints.
Maybe someone out there has Neblette's 3rd and could cite his reference.

A fast glance through B&S's Platinum Tech Notes revealed that the only
method mentioned for reducing Platinum prints is to use a sawdust slurry.
That method is in "The Photo-Miniature" May 1911, page 335. Naturally, I
could have missed something which I'm sure will be pointed out.

John Roseborough
        aka
Platinum Printer


----- Original Message -----
From: "Eric Neilsen" <ejnphoto@sbcglobal.net>
To: "'John Roseborough'" <platinumprinter@msn.com>
Sent: Tuesday, February 13, 2007 1:53 PM
Subject: RE: PT/PD MOGULS, MAESTROS & GURUS


> Ah,  well I'll look up that reference later as my copy ( don't know the
> edition off the top of my head) has some mistakes. Don't read that to say
> it
> is not worth owning but Luis sources have provided him with questionable
> information.  Does he cite his information for that information?
>
> Eric Neilsen Photography
> 4101 Commerce Street
> Suite 9
> Dallas, TX 75226
> http://e.neilsen.home.att.net
> http://ericneilsenphotographycom
> Skype ejprinter
>> -----Original Message-----
>> From: John Roseborough [mailto:platinumprinter@msn.com]
>> Sent: Tuesday, February 13, 2007 12:59 PM
>> To: alt-photo-process-l@usask.ca
>> 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://ericneilsenphotographycom
>> > 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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