U of S | Mailing List Archive | alt-photo-process-l | RE: re-clearing pt/pd

RE: re-clearing pt/pd

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  • Subject: RE: re-clearing pt/pd
  • From: EJN Photo <ejnphoto@sbcglobal.net>
  • Date: Fri, 02 Jan 2009 08:01:26 -0600
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Since you are working with PD only there are some problems of H2O2 that you
will not run across; namely conversion of PT to a bad or useable form in
your coating solution. In using H2O2 it is like many other contrast agents
in that you have full strength and then several dilutions to make it match
your process. In this case it is a 3% solution is full. You can dilute it
down to 1% or .5 % for use. Weird? Well when I used it as my primary
contrast boost, I had some negs that required as much as 10 drop of 3%. 

The digital negs have only gotten better over time with increase Dmax coming
from new inks, substrates and printers. You may post your set up and I am
sure that someone here can steer you close. I have been using a 4800 and an
ABW setting as well as Imagenomic RealGrain to make my negs. I also have
been testing a BO (black only) set. 

NA2/Platinic acid method I use a 1% 2.5%, 5% drops. I haven't found a need
to go higher than that. But I don't do PD only printing either. 

My digital negs require none to a few drops of 2.5% at an 8x10 size image. 

Eric Neilsen Photo
4101 Commerce Street, Suite 9
Dallas, TX 75226
214 827-8301
SKype ejprinter
-----Original Message-----
From: Paul Viapiano [mailto:viapiano@pacbell.net] 
Sent: Thursday, January 01, 2009 11:07 PM
To: alt-photo-process-l@usask.ca
Subject: Re: re-clearing pt/pd

> 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