[alt-photo] Re: platinum IV question

[Diana Bloomfield]

Yes-- thanks, Keith.  That's exactly it.  I do use it with the palladium. 

 I have some-- and don't need any more, but someone I know is starting out in pt/pd printing, and I didn't want him to get the standard platinum stuff, but all I have written on my bottle here is Pt IV (from Photographers Formulary)-- nothing else written there.  But -- yes-- it's Na2.  I just couldn't remember what to tell him to ask for specifically-- so thanks!!  

I did call Photographers Formulary after I sent this post-- and she said they have it on hand only when they've had a workshop-- so they don't typically sell it.  Though I never took a workshop there, I must have just called them once and they had some.  She did say they have some in stock now (left over from a summer workshop), so you can get it (just not advertised).

Anyway . . .  thanks so much.  

Diana
On Jan 31, 2013, at 2:04 PM, Keith Schreiber wrote:

> 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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