Re: NA2 For Pt/Pd BLENDS

DEAR SANDY,
     I have tested (though neither extensively nor rigorously) I like
the color, speed, and contrast I get with 1:3 Pt/Pd ratio I use. I
just wanted to try the Na2 for contrast control and was hoping that
someone might have some info to share.
     Thanks!
       CHEERS!
         BOB

----- Original Message -----
From: Sandy King <sanking@clemson.edu>
Date: Friday, December 5, 2003 1:37 pm
Subject: Re: NA2 For Pt/Pd BLENDS

> Bob,
>
> There are several people on this list who know a lot more than me
> about pt/pd printing so I will stand corrected if any of the
> following is in error.
>
> But, here is the way I see it.
>
> 1. Since Na2 is platinum, when you add it to palladium you now
> have a
> Pt/Pd blend.
>
> 2. In most Pt/Pd blends, excluding those with Na2, palladium is
> far
> and away the most dominant metal in terms of imparting its
> printing
> characteristics in terms of speed and contrast. I just completed a
> series of curves with several different light sources of two
> different sensitizers, one of pure palladium and another of a 50%
> blend of platinum and palladium. The curves of both families are
> virtually identical at every point, from the toe all the way
> through
> the shoulders. They are in fact virtually mirror matches of each
> other. A family of pure platinum curves, on the other hand, has a
> very, very different looking curve.
>
> My question would be, what would be the advantage of a blend of
> Pt/Pd
> over pure palladium if you intend to later add Na2?
>
> Sandy
>
>
>
>
>
>
> >DEAR SANDY,
> > Dick Arentz's table is one of the things I have saved but
> it seems
> >to be for pure Pd, not Pt/Pd blends ...unless I am missing something.
> > I am hoping someone has used it with Pt/Pd blends.
> > CHEERS!
> > BOB
> >
> >----- Original Message -----
> >From: Sandy King <sanking@clemson.edu>
> >Date: Friday, December 5, 2003 12:36 pm
> >Subject: Re: NA2 For Pt/Pd blends
> >
> >> Bob,
> >>
> >> Na2 definitely works. Dick Arentz has some data on its use at his
> >> web site.
> >>
> >> http://www.dickarentz.com/
> >>
> >> Sandy
> >>
> >>
> >>
> >>
> >>
> >> >DEAR LIST,
> >> > I have saved the recommended dilutions and numbers of
> drops for
> >> >using Na2 as a contrast controling agent for pure Palladium
> >> printing.
> >> >I usually use a Pt to Pd drop ratio of 1:3. Eg 4 drops Pt
> plus 12
> >> >drops Pd plus FO. My questions:
> >> >1)Does anyone on the list have experience using Na2 as a contrast
> >> agent>with Pt/Pd blends?
> >> >2) Does it work?
> >> >3) Would you be willing to share your data?
> >> > Thanks in advance!
> >> > CHEERS!
> >> > BOB
> >>
> >>
>
>
Received on Fri Dec 5 13:20:20 2003