Re: re-clearing pt/pd

[Paul Viapiano <viapiano@pacbell.net>]

Hi Matt...

Nice to hear from you...and happy new year!

I'm actually trying to standardize on pure palladium with no contrast agent 
at all. That's what I was trying to do with traditionally enlarged negs and 
I was pretty successful, at least to my eyes. I had a bit of a breakthrough 
in the last few days with a digi-neg profile for the QTR program, seemed to 
print a full range 101-step wedge with an as-close-as-can-be patch of paper 
white...maybe it only needs to be passed over an open bottle of NA2 ;-)

Thanks so much for the drop count/dilution info. It expands on your previous 
email to me some weeks ago and is very helpful.

Paul



----- Original Message ----- 
From: "Matthew Magruder" <me@scootermagruder.com>
To: <alt-photo-process-l@usask.ca>
Sent: Wednesday, December 31, 2008 2:14 PM
Subject: Re: re-clearing pt/pd


> Paul
> with small 4x5/5x7 prints. Using 1 or 2 drops of 2.5% Na2 would be 
> fitting (or even 4-5 if the neg is really thin).
> If you think about it... if you are using a 6 drop ratio (6 drops  Ferric 
> Ox & 6drops pd metal for a 4x5) then 1 drop of 2.5% or 5% Na2  is actually 
> a fairly large percentage of the overall drop count.
> I'm using 2.2ml of Ferric Ox and 2.2ml of Pd  (thats roughly 44drops  of 
> each) for a 12x20 area.  and with that amount I usually use my 5%  Na2 or 
> 10% Na2 and in the range of 2-10 drops. Just to give you a  sense of 
> comparison.
> You should be able to create and build a curve that will print well  with 
> whatever Na2/FO#2 ratio you standardize on.
> I know many folks on here do digineg printing. theyll know far more  than 
> I.
>
> Matt
>
>
>
> On Dec 30, 2008, at 5:41 PM, Paul Viapiano wrote:
>
> > Well, I'm not getting grain or any other artifacts with one drop of  FO 
> > #2 for palladium.
> >
> > What I am having trouble with is getting a contrasty enough  negative 
> > when working with digital negs ;-)
> >
> > I haven't tried NA2 yet, though I have about 5ml of the stuff at  20%. 
> > Since I'm making small prints (4x5 and/or 5x7) I'm wondering  if I can 
> > get by with diluting it to 2.5% and using a drop or two at  that 
> > strength...
> >
> > Thanks, Eric...btw, how many drops of H2O2 will a print take before 
> > getting weird? (taking into account total drops, print size, etc)
> >
> > Paul
> >
> >
> >
> > ----- Original Message ----- From: "Eric Neilsen" 
> > <ejnphoto@sbcglobal.net>
> > To: <alt-photo-process-l@usask.ca>
> > Sent: Tuesday, December 30, 2008 2:15 PM
> > Subject: RE: re-clearing pt/pd
> >
> >
> > > Paul, If you are asking will potassium chlorate cause grain right  away 
> > > it
> > > may depend on what strength you are using but it happens very  fast. 
> > > Quite a
> > > number of years back, I tested the FO with chlorate against H2O2 as a
> > > contrast agent and the speed at which grain appeared in the print  was 
> > > upon
> > > the first or second drop but only with the chlorate.
> > >
> > > Platonic acid or NA2 will not cause it at one or two or a bunch of 
> > > drops.
> > >
> > > Eric Neilsen
> > > 4101 Commerce Street, Suite 9
> > > Dallas, TX 75226
> > > 214-827-8301
> > >
> > > www.ericneilsenphotography.com
> > > SKYPE ejprinter
> > >
> > > -----Original Message-----
> > > From: Paul Viapiano [mailto:viapiano@pacbell.net]
> > > Sent: Friday, December 19, 2008 4:13 PM
> > > To: alt-photo-process-l@usask.ca
> > > Subject: Re: re-clearing pt/pd
> > >
> > > Hi all...
> > >
> > > Thanks for the clearing suggestions...HCA after citric has worked 
> > > great!
> > >
> > > Now, I know that NA2 is the thing for contrast control, and  everyone 
> > > has
> > > warned me off of Solution #2 oFO, but if I only need a drop or two  of 
> > > #2, it
> > >
> > > should be OK, right? Without any problems of grain or anything?
> > >
> > > (5/1 or 10/2 type of ratio for the FO...)
> > >
> > > Paul