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#61
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PQ Stain
Jorge Oliveira
Al Carlos carvalho 928/8 80430-180 Curitiba PR Brazil Jorge Patrick Gainer wrote in : I'm back in good health. It was some kind of intestinal bug. I used to call it "24 hour crud" but everything is slower now, so it's more like 48 hours. I believe I promised to send some negs and prints to demonstrate some of the things I have learned lately. First one to supply a snail mail address gets it. That person can pass the package on down the list if there are more than one. Pat |
#62
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PQ Stain
Dennis O'Connor wrote: Dr. Dennis O'Connor 570 N. Hemlock Rd. PO Box 439 Hemlock, MI 48626 "Patrick Gainer" wrote in message ... nicholas wrote: Hi everyone, best wishes Patrick for a speedy recovery. It must be exhausting trying to explain that in some developers that Sulphite actually hinders rather than helps some developers - over and over again... ;-) Especially when it's true. I just wanted to post a follow-up to this developer, it is indeed amazing and I printed up a 6x6cm neg (Apx100) to 10x10 in it. No grain through my magnifier (Micromega Critical Focusser) and amazingly beautiful tones - on the paper that is. I have a new favorite developer. Thanks again Pat for introducing me to a (relatively) non toxic staining developer. Works wonderful. One caveat however, I will probably alter the dilution to at least 1:75 (most likely 1:100) because the time is too short with my normal metaborate-like alkaline component (around 5mins). Cheers Nicholas, I'm back in good health. It was some kind of intestinal bug. I used to call it "24 hour crud" but everything is slower now, so it's more like 48 hours. I believe I promised to send some negs and prints to demonstrate some of the things I have learned lately. First one to supply a snail mail address gets it. That person can pass the package on down the list if there are more than one. Pat You're on, Denny me boy. Tomorrow I will take to the post office a package containing 3 prints, 3 negative strips for the prints, and 3 negative strips of step density wedge developed together with corresponding picture negatives. Film is 400TX. The developer is the PC-Glycol concebtrate diluted 1+50 with a) 5 g pHPlus and 5 g borax per liter; b) the same with 20 g of sulfite added per liter; and c) 100 grams of sulfite + 2 grams of Kodalk (the real stuff) per liter. You may be surprised at what you see. Pat |
#63
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PQ Stain
Jorge Omar wrote
Undoubtly sulfite has a very pronounced effect on PA devs. If one develops without any sulfite for the same film/time/temp/concentration, using borax as accelerator (12g/liter working), negatives will be thin to the point of been unprintable. Add sulfite to 25g/liter working, and all is swell... That reaction to the sulfite addition is due to the increase in ph. If I recall correctly 1% solutions of borax and sulfite measure 9, and 10.6. Sulfite will up the ph way above borax. Crawley via P. Dignan states, ... sulfite removes surface flare and image spread. He is speaking of FX-13. R. Suzuki adds sulfite to FX-1, IIRC, to improve the gradiation. I'm about to brew up some FX-1 and should investigate the matter. Dan |
#65
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PQ Stain
Jorge Omar wrote
No, sulfite does not rises pH of a borax solution, actually it lowers a little bit. I've mixed a borax 12g/l solution, measured pH and then added sulfite at 25g/l. pH went down by 0.2 pH (at lest using my meter). It has to do with exposing dev centers or alike. I've not combined borax and sulfite and then measured the ph. I will duplicate the above conditions and post the results. Dan Jorge Omar wrote: Undoubtly sulfite has a very pronounced effect on PA devs. If one develops without any sulfite for the same film/time/temp/concentration, using borax as accelerator (12g/liter working), negatives will be thin to the point of been unprintable. Add sulfite to 25g/liter working, and all is swell... Dan wrote: That reaction to the sulfite addition is due to the increase in ph. If I recall correctly 1% solutions of borax and sulfite measure 9, and 10.6. Sulfite will up the ph way above borax. Crawley via P. Dignan states, ... sulfite removes surface flare and image spread. He is speaking of FX-13. R. Suzuki adds sulfite to FX-1, IIRC, to improve the gradiation. I'm about to brew up some FX-1 and should investigate the matter. Dan |
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