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#1
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Which Homebrew for High Speed Film?
Dan Quinn wrote: I've been using FX-1 for Pan F+ but think it will yield too much grain with HP5, Tri X, and Delta 3200. I'm considering FX-13 which is a FX-1 type but is loaded with sulfite. That is something of a contradiction. D76, D23, and others, which are easy Homebrews, may be good choices. I'd like to steer clear of any phenidone included developers. Dan Surprised you haven't tried www.unblinkineye.com on ascorbate developers. No sulfite. Use metol or phenidone, ascorbic or erythorbis (isoascorbic) acid. The rest you can get at the hardware or grocery store. |
#2
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Which Homebrew for High Speed Film?
"Dan Quinn" wrote in message om... I've been using FX-1 for Pan F+ but think it will yield too much grain with HP5, Tri X, and Delta 3200. I'm considering FX-13 which is a FX-1 type but is loaded with sulfite. That is something of a contradiction. D76, D23, and others, which are easy Homebrews, may be good choices. I'd like to steer clear of any phenidone included developers. Dan Why do you want to avoid Phenidone? Why avoid sulfite? How much speed do you want from the film? D-76 yields close to the maximum speed for many films but is not the best choice for pushing a film like Delta 3200. It gives a good balance of speed vs: grain. If you mix your own D-76 use the buffered formula with 8 grams of Borax and 8 grams of Boric acid per liter and reduce the sulfite to 80 grams per liter. This will give you slightly better performance than the original formula. Also, if you use it diluted 1:1 you might want to mix it using half the amount of all ingredients except the sulfite. That will result in slightly finer grain and possibly slightly higher speed than just diluting it. Sulfite doesn't work the way most people think it does. All of the films named above will be grainy compared to Pan F+ regardless of the developer. For the very maximum speed out of Delta 3200 or Kodak T-Max P3200 use T-Max RS. Of course its not home brew and does have Phenidone in it despite its non-appearance in the MSDS. -- --- Richard Knoppow Los Angeles, CA, USA |
#3
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Which Homebrew for High Speed Film?
"Dan Quinn" wrote in message om... I've been using FX-1 for Pan F+ but think it will yield too much grain with HP5, Tri X, and Delta 3200. I'm considering FX-13 which is a FX-1 type but is loaded with sulfite. That is something of a contradiction. D76, D23, and others, which are easy Homebrews, may be good choices. I'd like to steer clear of any phenidone included developers. Dan Why do you want to avoid Phenidone? Why avoid sulfite? How much speed do you want from the film? D-76 yields close to the maximum speed for many films but is not the best choice for pushing a film like Delta 3200. It gives a good balance of speed vs: grain. If you mix your own D-76 use the buffered formula with 8 grams of Borax and 8 grams of Boric acid per liter and reduce the sulfite to 80 grams per liter. This will give you slightly better performance than the original formula. Also, if you use it diluted 1:1 you might want to mix it using half the amount of all ingredients except the sulfite. That will result in slightly finer grain and possibly slightly higher speed than just diluting it. Sulfite doesn't work the way most people think it does. All of the films named above will be grainy compared to Pan F+ regardless of the developer. For the very maximum speed out of Delta 3200 or Kodak T-Max P3200 use T-Max RS. Of course its not home brew and does have Phenidone in it despite its non-appearance in the MSDS. -- --- Richard Knoppow Los Angeles, CA, USA |
#4
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Which Homebrew for High Speed Film?
"Richard Knoppow" wrote in message ...
"Dan Quinn" wrote in message om... I've been using FX-1 for Pan F+ but think it will yield too much grain with HP5, Tri X, and Delta 3200. I'm considering FX-13 which is a FX-1 type but is loaded with sulfite. That is something of a contradiction. D76, D23, and others, which are easy Homebrews, may be good choices. I'd like to steer clear of any phenidone included developers. Dan Why do you want to avoid Phenidone? Why avoid sulfite? How much speed do you want from the film? D-76 yields close to the maximum speed for many films but is not the best choice for pushing a film like Delta 3200. It gives a good balance of speed vs: grain. If you mix your own D-76 use the buffered formula with 8 grams of Borax and 8 grams of Boric acid per liter and reduce the sulfite to 80 grams per liter. This will give you slightly better performance than the original formula. Also, if you use it diluted 1:1 you might want to mix it using half the amount of all ingredients except the sulfite. That will result in slightly finer grain and possibly slightly higher speed than just diluting it. Sulfite doesn't work the way most people think it does. All of the films named above will be grainy compared to Pan F+ regardless of the developer. For the very maximum speed out of Delta 3200 or Kodak T-Max P3200 use T-Max RS. Of course its not home brew and does have Phenidone in it despite its non-appearance in the MSDS. I'd suggest ID-68 for what it's worth. |
#5
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Which Homebrew for High Speed Film?
"Richard Knoppow" wrote
Why do you want to avoid Phenidone? The phenidone I have on hand is a few years old. If it were fresh I'd likely still not use it because of consistency and usefull life expectancy concerns. Why avoid sulfite? Save for it's preservation property I've no use for it at this time. A less than 1% addition of it will keep a one-shot developer clear long enough. Also sulfite is an alkali and affects ph. Mr. Gainer suggested Ascorbic acid. It will preserve but do so too well. If I'm correct, Vit. C will regenerate metol. That's OK if local depletion is not wished. Sulfite on the other hand will preserve but not regenerate. Mr. Gainer can correct me if I'm wrong. How much speed do you want from the film? A low ph developer such as D25, a metol-sulfite/bisulfite mix, gives low speed. I think metol needs a higher ph to deliver full speed. It's a matter of grain versus speed. ISO 800 will do. If the grain is more than I care for a lower speed film will have to do. Dan |
#6
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Which Homebrew for High Speed Film?
Michael
I've seen the unnamed formula you've posted refered as Kendal Microphen. There's still another one, posted in photo.net by Tomasz Klimkiewicz with components that are closer to the MSDS: Sodium sulfite - 100 g Hydroquinone - 5 g Phenidone - 0.2 g Borax - 6.8 g Boric acid - 2.7 g Sodium metabisulphite - 0.65 g Potassium bromide - 1.0 g Water to make - 1000 ml Jorge (Michael Scarpitti) wrote in om: There is an unnamed phenidone formula that is a little different from ID-68 that is supposed to be close to Microphen: Sod. Sulphite Anhy. 100g Hydro. 5g Borax 3g Boric Acid 3.5 Pot. Bromide 1 Phenidone 0.2 Add cold water to make - 1000 mL Here's ID-68: Sodium Sulfite (desiccated) -85.0 grams Hydroquinone - 5.0 grams Borax 7.0 - grams Boric Acid - 2.0 grams Potassium Bromide - 1.0 grams Phenidone - 0.13 grams Add cold water to make - 1000 mL Richard Knoppow Los Angeles, CA, USA |
#7
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Which Homebrew for High Speed Film?
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#8
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Which Homebrew for High Speed Film?
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#9
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Which Homebrew for High Speed Film?
"Dan Quinn" wrote in message om... "Richard Knoppow" wrote Why do you want to avoid Phenidone? The phenidone I have on hand is a few years old. If it were fresh I'd likely still not use it because of consistency and usefull life expectancy concerns. Why avoid sulfite? Save for it's preservation property I've no use for it at this time. A less than 1% addition of it will keep a one-shot developer clear long enough. Also sulfite is an alkali and affects ph. Mr. Gainer suggested Ascorbic acid. It will preserve but do so too well. If I'm correct, Vit. C will regenerate metol. That's OK if local depletion is not wished. Sulfite on the other hand will preserve but not regenerate. Mr. Gainer can correct me if I'm wrong. How much speed do you want from the film? A low ph developer such as D25, a metol-sulfite/bisulfite mix, gives low speed. I think metol needs a higher ph to deliver full speed. It's a matter of grain versus speed. ISO 800 will do. If the grain is more than I care for a lower speed film will have to do. Dan The speed loss in D-25 is due to mostly to the solvent action of the sulfite. When this solvent action is moderate, as in D-76 or D-23, it exposes more development centers in the silver halide crystals increasing speed. When the action is greater, as in D-25 and Microdol-X, it etches away some of the development specs reducing the speed. In effect, it destroys some of the latent image. This is the price for the extra-fine-grain property of these developers. When they are diluted the ratio of development time to dilution is not linear so the effective solvent action is reduced. At 1:3 D-25, Microdol-X, Perctptol, and similar developers deliver full film speed but lose their extra-fine-grain property. There is a mutually regenerative effect between Metol or Phenidone and Hyroquinone. This is a different effect than the effect of Sulfite which is to prevent the production of the reaction products. Ascorbic acid will not take the place of sulfite although there are organic compounds which will. These are used in liquid concentrate developers. The effects of Sulfite are many in developers. The effects are well covered in highly technical books on photographic chemistry. I think they are understandable even if one does not have an advanced understanding of chemistry. All of these are old and must be found in libraries. The classic is _Theory of the Photographic Process, C.E.K. Meese. I think Ryuji Suzuki has some stuff about ascorbic acid developers on his web site: http://www.silvergrain.org -- --- Richard Knoppow Los Angeles, CA, USA |
#10
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Which Homebrew for High Speed Film?
"Dan Quinn" wrote in message om... "Richard Knoppow" wrote Why do you want to avoid Phenidone? The phenidone I have on hand is a few years old. If it were fresh I'd likely still not use it because of consistency and usefull life expectancy concerns. Why avoid sulfite? Save for it's preservation property I've no use for it at this time. A less than 1% addition of it will keep a one-shot developer clear long enough. Also sulfite is an alkali and affects ph. Mr. Gainer suggested Ascorbic acid. It will preserve but do so too well. If I'm correct, Vit. C will regenerate metol. That's OK if local depletion is not wished. Sulfite on the other hand will preserve but not regenerate. Mr. Gainer can correct me if I'm wrong. How much speed do you want from the film? A low ph developer such as D25, a metol-sulfite/bisulfite mix, gives low speed. I think metol needs a higher ph to deliver full speed. It's a matter of grain versus speed. ISO 800 will do. If the grain is more than I care for a lower speed film will have to do. Dan The speed loss in D-25 is due to mostly to the solvent action of the sulfite. When this solvent action is moderate, as in D-76 or D-23, it exposes more development centers in the silver halide crystals increasing speed. When the action is greater, as in D-25 and Microdol-X, it etches away some of the development specs reducing the speed. In effect, it destroys some of the latent image. This is the price for the extra-fine-grain property of these developers. When they are diluted the ratio of development time to dilution is not linear so the effective solvent action is reduced. At 1:3 D-25, Microdol-X, Perctptol, and similar developers deliver full film speed but lose their extra-fine-grain property. There is a mutually regenerative effect between Metol or Phenidone and Hyroquinone. This is a different effect than the effect of Sulfite which is to prevent the production of the reaction products. Ascorbic acid will not take the place of sulfite although there are organic compounds which will. These are used in liquid concentrate developers. The effects of Sulfite are many in developers. The effects are well covered in highly technical books on photographic chemistry. I think they are understandable even if one does not have an advanced understanding of chemistry. All of these are old and must be found in libraries. The classic is _Theory of the Photographic Process, C.E.K. Meese. I think Ryuji Suzuki has some stuff about ascorbic acid developers on his web site: http://www.silvergrain.org -- --- Richard Knoppow Los Angeles, CA, USA |
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