Re: ferric oxalate
Thanks, Brian. I'm gonna have to go get that book now.
I almost always use palladium with Na2 for any contrast.
I noticed too-- not much info on the web, but I need to get the second edition of Arentz's book.
Although I was in a panic some months ago, when I was getting ready for a show-- and I ran out of developer right at the 11th hour. I typically use potassium oxalate-- and, naturally, I'm 1,000 miles-- at least-- from anybody who sells it. And my platinum printer friend here was out of town-- so, I did find this little recipe for a sodium acetate developer on the web-- a weird mix of distilled white vinegar and sodium bicarbonate-- all readily available at my local grocery store. I had to go buy this stuff by the gallon/pound-- and felt like a Mr. Wizard mixing up this concoction-- but it worked like a charm. Definitely a cooler (less warm) look in the final print, but it worked fine. And the prints still look good. :)
On Nov 10, 2008, at 5:48 PM, Brian Pawlowski wrote:
Thanks Brian. So that's it-- nothing else added? I was heating the water, but maybe it should be hotter. I do like the Chubby Checker idea, though-- I'll try that and-- you know-- dance like I did last summer.So, what Pt/Pd process for contrast will you use? That affects the solution. Na2 process uses Ferric Oxalate in water as the sensitizer, Na2 contrast agent (smidgen), and Palladium sol'n (will *not* work with Platinum!). Wow - I was trying to find a simple web page that describes the Na2 contrast method for Palladium, but haven't found anything I can fwd. The other widely used method is the ratio method, and there is a pretty good write up here: http://www.bostick-sullivan.com/articles/platprintsimple.html This is all well described in Arentz Pt/Pd *Second* Edition... I'm a little surprised there is not more readily available canned info on the web that summarizes this... Odd. Boy, there are other methods than Na2 and ratio methods out there (Ware's approach, hydorgen peroxide Rudiak mentions, and use of dichromate in developer for contrast control - all of these are also covered in Arentz bible...) Wheeee!