Re: ferric oxalate
Wow! There's no way I can move anything like that right now (tore a tendon/ligament in my back), but I will need a refill in the not-so-distant future. Thanks, Eric. -Jeremy- On Mon, Nov 10, 2008 at 5:50 PM, EJN Photo <ejnphoto@sbcglobal.net> wrote: > Jeremy, Next time you are in the area, I'll show you the local chemical > supply where it will save you even more. 50lbs bags Pot Carb is about 60.00 > +/-. > > > > Eric Neilsen Photo > 4101 Commerce Street, Suite 9 > Dallas, TX 75226 > 214 827-8301 > > http://ericneilsenphotography.com > SKype ejprinter > > -----Original Message----- > From: Jeremy Moore [mailto:jeremydmoore@gmail.com] > Sent: Monday, November 10, 2008 5:27 PM > To: alt-photo-process-l@usask.ca > Subject: Re: ferric oxalate > > To tack on to the end of Clay's email, Diana, check out > http://www.chemistrystore.com/ for prices on bulk oxalic acid and > potassium carbonate. I have had good and quick service from them in > the past to get these same chemicals. > > -Jeremy- > > On Mon, Nov 10, 2008 at 5:21 PM, Clay Harmon <wcharmon@wt.net> wrote: >> Diana, >> >> It is pretty easy to mix up your own potassium oxalate developer from >> combining oxalic acid, potassium carbonate and water. Here is a cut and >> pasted recipe from Carl Weese: >> >>> 2 lbs of Pot Carb with 1.75 lbs oxalic acid to make 1 gallon of water. 1 >>> lbs = 457 >>> g and 1 gallon = 3.8 l ( top of my head but close enough as it is just > POT >>> OX). >>> >>> Mix you Pot Card into cool distilled water; about 1/2 your total volume. >>> SLOWLY add your Ox Acid as it WILL BUBBLE!!!!. Add to completion and > top >>> off with water to make final volume. >> >> Clay >> >> >> On Nov 10, 2008, at 5:02 PM, Diana Bloomfield wrote: >> >>> 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! >>> >> >> > >
|