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 11:39:01 2003