[alt-photo] Re: platinum

[Christina Anderson]

Marek,

This is about a 0.75% solution, correct (muriatic acid is 37%?)? I've heard as low as 2% hydrochloric acid but you seem to feel that even lower does the trick?

It would be nice to just use one paper (FAEW) in the dimroom but there is no way I could control muriatic acid in the dimroom with a bunch of students unless I mixed up a gallon myself for them, especially since a student in a beginning class has filed a Risk and Safety complaint because another student splashed a drop of fixer in his eye. If this becomes an issue (fixer) you never know what else will be scritinized...

This is a very low dilution and seems quite doable, though!

How long does it last/how many pieces of paper per liter?

I do so love FAEW paper.

Chris

Christina Z. Anderson
christinaZanderson.com

On Feb 14, 2013, at 8:54 PM, Marek Matusz wrote:

> 
> Paul, 20cc acid to 1 liter of water. place dry sheets of paper and wait for bubbles to go away, maybe 2-3 minutes. After a couple of sheets I just add more acid. If you don't get any bubbles the acid bath is exhausted. Wash the paper with plenty of water to remove the acid. Marek
>> From: viapiano at pacbell.net
>> Date: Thu, 14 Feb 2013 12:51:56 -0800
>> To: alt-photo-process-list at lists.altphotolist.org
>> Subject: [alt-photo] Re: platinum
>> 
>> Marek, 
>> 
>> What dilution and for how long do you treat with the acid?
>> 
>> P
>> 
>> On Feb 14, 2013, at 10:32 AM, Marek Matusz <marekmatusz at hotmail.com> wrote:
>> 
>>> 
>>> 
>>> Here is another something on palladium/platinum papers.
>>> 
>>> 
>>> A couple of months ago I acid treated some Fabriano Artistico sot press. My acid treatment was HCl (hydrochloric or muratic acid). Very inexpensive from pool supply store. This treatment completely removes carbonate buffer leaving just pure paper. I have to say it is one of the best palladium papers that I have used in a while. This treated Fabriono resembles COT 320 in many ways. Beautiful DMAX, and just the right absorbency. Because of the pretreatment (in the old days I would call it pre-shrinking, but now to me it is just getting it wet and do the shrinking /stretching that it wants) step it is very easy to do a gum over the palladium layer.
>>> 
>>> Marek                         
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