Re: NA2 For Pt/Pd BLENDS

Hi Bob,

I understand what you meant.

What I am trying to say, however, is that with my tests of Na2 with
various combinations of palladium and platinum I found that it had
the same impact in terms of contrast on a sensitizer made with 100%
palladium as on one made with a 50/50 blend of platinum and
palladium. I also found this to be true for the 1:3 pt/pd ratio,
though I did not mention it earlier.

In other words, just apply the Arentz data for pt/pd blends from pure
palladium up to 50/50 palladium and platinum as you would apply it to
pure palladium.

No doubt but that some conditions of RH and temperature may give
different results, but these were my findings and the tests were
carried out very carefully, and repeated several times, since the
results are for publication.

Sandy

>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 14:07:30 2003