[alt-photo] Re: platinum IV question

[Keith Schreiber]

I'm not familiar with the nomenclature used by Photographer's Formulary, but it sounds like what you are describing is what B&S calls "Na2" platinum solution (Na2PtCl6). Here is a reference that may help clear up the naming confusion. 

	http://www.sigmaaldrich.com/catalog/product/aldrich/288152?lang=en&region=US

The standard platinum solution used in the platinum printing process is Potassium Chloroplatinite 15% (K2PtCl4). 

You can still get "Na2" platinum solution from B&S. I don't see any platinum or palladium solutions currently at Photographer's Formulary.

Note that "Na2" is used as an additive to increase contrast with palladium printing, not if you are using the standard platinum solution.

~ Keith


On Jan 31, 2013, at 11:11 AM, Diana Bloomfield wrote:

> Hi all,
> 
> Maybe someone can answer this question for me.  You know the platinum you can get that Photographers Formulary used to sell-- not sure they still do-- it was labeled Platinum IV?  It was different from the Solution 3 B&S sells, in that it added contrast but without the grain sometimes accompanied with Pt Solution 3?  Does B&S sell that?
> 
> Can someone tell me the real technical name for that, and where can I find it now?  Does Artcraft sell that, or B&S, and what do I call it??  I'm not sure of the technical differences between Pt Solution 3 and this Platinum IV, but I know the difference when I see it. :)
> 
> Thanks for any and all advice.
> 
> Diana
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