RE: PT/PD MOGULS, MAESTROS & GURUS
DEAR ERIC ET AL, I cut a processed test print in half so that I could compare tones from highlights to shadows. I mixed 18 ml HCl (a little stronger than 1:60) into one L of H20. I presoaked one of the halves in water for 5 minutes and then soaked it in the HCl clearing bath for 20 minutes. It is washing as I type. I will report results when dry by comparing it to the half not treated in the HCl clearing bath. . CHEERS! BOB -----Original Message----- From: Eric Neilsen [mailto:ejnphoto@sbcglobal.net] Sent: Wednesday, February 14, 2007 1:35 PM To: alt-photo-process-l@usask.ca Subject: RE: PT/PD MOGULS, MAESTROS & GURUS Bob, you'll notice that they sell HCL/muriatic acid in plastic bottles. I think you're safe there. Highly concentrated acid should be in glass, but weaker mixes you are ok with some plastics. Jeremy, I use Sodium Sulfite and both EDTA Di and Tetra sodium salts. The disodium has a lower pH and is used first in the clearing sequence. Early on in my platinum printing experience, I assisted Chuck Henningsen with his printing out in Portola Valley, CA. We had a exhaust system in the darkroom to pull out the fumes from our processes; B&W, Cibachrome in large tube for processing 30" x 40", and pt/pd prints. It wasn't until we relocated to Taos, NM that I saw what it actually did. There was no vent to the outside, just into the attic. The studio had many canned lights that were unsealed, so the attic air was free to roam back down into the studio. Just about every piece of metal in that studio should some signs of rust and corrosion. I occasionally use oxalic, citric and phosphoric acid and some hard to clear papers. I also use a stronger mix of disodium/sulfite mix as well. 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: BOB KISS [mailto:bobkiss@caribsurf.com] > Sent: Wednesday, February 14, 2007 11:16 AM > To: alt-photo-process-l@usask.ca > Subject: RE: PT/PD MOGULS, MAESTROS & GURUS > > HI, > I am going to try the 1:60 HCl to water clearing bath. Can I store > this dilute HCl clearing bath in a plastic bottle or must I use glass. > CHEERS! > BOB > > -----Original Message----- > From: Eric Neilsen [mailto:ejnphoto@sbcglobal.net] > Sent: Wednesday, February 14, 2007 12:50 PM > To: alt-photo-process-l@usask.ca > Subject: RE: PT/PD MOGULS, MAESTROS & GURUS > > You may try it on a wet, freshly processed print first. I am home with flu > today, so no testing for a little while. : ( I will have to go out and > buy > some for testing. I have been using alternatives to the HCL for quite some > time. > > 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: BOB KISS [mailto:bobkiss@caribsurf.com] > > Sent: Wednesday, February 14, 2007 8:14 AM > > To: alt-photo-process-l@usask.ca > > Subject: RE: PT/PD MOGULS, MAESTROS & GURUS > > > > DEAR CHRISTINA, > > I do have HCl in the "pool cleaner" form. I will see if I can do > > the 1:60 dilution test on one of the test strips that I have kept. I > will > > tear it in half such that I have the same tones on both pieces, "bleach" > > one > > and then do a dry comparison. I may even get out my X-Rite and be > > somewhat > > scientific about it! > > CHEERS! > > BOB > > > > -----Original Message----- > > From: Christina Z. Anderson [mailto:zphoto@montana.net] > > Sent: Wednesday, February 14, 2007 12:39 AM > > To: Alt, List > > Subject: 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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