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#1
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GAF-125, very easy to be oxgenated
here is GAF-125 found in jack's photographic site which is said to be
similar to kodak d-72, Water (125°F/52°C) 750 ml Metol 3 g Sodium Sulfite (anhy) 44 g Hydroquinone 12 g Sodium Carbonate (anhy) 65 g Potassium Bromide 2 g Cold water to make 1000 ml but i found, the stock solution is very easy to go brown, usually in 3 to 5 days. i think that is not normal and hope for some clues. thanks. - woody |
#2
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GAF-125, very easy to be oxgenated
"Steven Woody" wrote in message ps.com... here is GAF-125 found in jack's photographic site which is said to be similar to kodak d-72, Water (125°F/52°C) 750 ml Metol 3 g Sodium Sulfite (anhy) 44 g Hydroquinone 12 g Sodium Carbonate (anhy) 65 g Potassium Bromide 2 g Cold water to make 1000 ml but i found, the stock solution is very easy to go brown, usually in 3 to 5 days. i think that is not normal and hope for some clues. thanks. - woody A correction to the above, the amount of Sodium Carbonate is for the monohydrated form, for anhydous carbonate reduce the amount to 54 grams. This is not the problem, the stock solution will probably be a light straw color when mixed and should last about 6 months in a filled, closed bottle. The rapid oxidation may be due to the method used to mix the solution or perhaps to a defective ingredient. The Metol and Hydroquinone should be white or gray. A slight tan indicates some oxidation but it may still be OK. Neither should be brown. Make sure the Sodium Sulfite is not somthing else. To mix use water which has been boiled for about five minutes and allowed to stand undisturbed until cool. The boiling will drive off most dissolved gasses and also remove some minerals. Pour off the clear water slowly so that air is not forced into it. Dissolve the Metol first, Metol will not dissolve in a strong solution of Sulfite. It is sometimes suggested that a small amount of Sulfite be mixed first (about 15 grams per liter) to scavenge any gasses but the fist bit of Metol will do that. Once the Metol is dissolved add the sulfite and then the rest of the ingredients. Stir constantly when mixing but the stirring should not be so vigorous that it beats air into the solution. The stirring need only to be strong enough to keep the particles in suspension until they dissolve. Water temperature is normally given as 125F or 52C. However, if the ingredients will dissolve at a lower temperature its desirable to prevent decomposition. Do not use water hotter than 125F. Each ingredient should be completely dissolved before adding the next. Agfa/Ansco/GAF 125 is an intermediate strength paper developer. D-72/Dektol is stronger (more carbonate) and D-52 (Selectol) is much less active. Probably the closest other developer to No.125 is Defender 55-D although the two are not identical. Agfa's closest formula to D-72 is No. 103, which is nearly identical. Approximate equivalents a Kodak D-72 (Dektol), Defender 53-D (Identical to D-72), Agfa/Ansco 103 Kodak D-52 (Selectol), Defender 51-D (Identical), Agfa/Ansco 135 Kodak Selectol Soft (no published Kodak formula) Agfa/Ansco 120 (very similar) Agfa/Ansco 125, similar but not identical to Defender 55-D Kodak D-73 Blue-Black developer, Defender 54-D is identical, Agfa/Ansco does not appear to have an equivalent. Each company had certain formulas which were not approximated by others (Agfa/Ansco 130 for example. -- --- Richard Knoppow Los Angeles, CA, USA |
#3
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GAF-125, very easy to be oxgenated
Richard Knoppow wrote:
"Steven Woody" wrote in message ps.com... here is GAF-125 found in jack's photographic site which is said to be similar to kodak d-72, Water (125°F/52°C) 750 ml Metol 3 g Sodium Sulfite (anhy) 44 g Hydroquinone 12 g Sodium Carbonate (anhy) 65 g Potassium Bromide 2 g Cold water to make 1000 ml but i found, the stock solution is very easy to go brown, usually in 3 to 5 days. i think that is not normal and hope for some clues. thanks. - woody A correction to the above, the amount of Sodium Carbonate is for the monohydrated form, for anhydous carbonate reduce the amount to 54 grams. so, if i used 65g anhydous, that equals to 80g mono, that is exactly a Kodak d-72 (dekol), is it? thank you for telling me that, on the other hand, i don't care what i am using is a d-72 or gaf-125. This is not the problem, the stock solution will probably be a light straw color when mixed and should last about 6 months in a filled, closed bottle. do you mean the stock solution will last 6 months or the mixed working solution will last 6 months? The rapid oxidation may be due to the method used to mix the solution or perhaps to a defective ingredient. The Metol and Hydroquinone should be white or gray. A slight tan indicates some oxidation but it may still be OK. Neither should be brown. Make sure the Sodium Sulfite is not somthing else. because i also mix d-76d film developer, so i think the metol, hydroquinone as well as sodium sulfite is okay. To mix use water which has been boiled for about five minutes and allowed to stand undisturbed until cool. The boiling will drive off most dissolved gasses and also remove some minerals. i use distiled water but no boiling before mix. i will accept you advice but i am wondering if that can make such a big difference. Pour off the clear water slowly so that air is not forced into it. Dissolve the Metol first, Metol will not dissolve in a strong solution of Sulfite. It is sometimes suggested that a small amount of Sulfite be mixed first (about 15 grams per liter) to scavenge any gasses but the fist bit of Metol will do that. Once the Metol is dissolved add the sulfite and then the rest of the ingredients. Stir constantly when mixing but the stirring should not be so vigorous that it beats air into the solution. The stirring need only to be strong enough to keep the particles in suspension until they dissolve. Water temperature is normally given as 125F or 52C. However, if the ingredients will dissolve at a lower temperature its desirable to prevent decomposition. Do not use water hotter than 125F. Each ingredient should be completely dissolved before adding the next. Agfa/Ansco/GAF 125 is an intermediate strength paper developer. D-72/Dektol is stronger (more carbonate) and D-52 (Selectol) is much less active. Probably the closest other developer to No.125 is Defender 55-D although the two are not identical. Agfa's closest formula to D-72 is No. 103, which is nearly identical. Approximate equivalents a Kodak D-72 (Dektol), Defender 53-D (Identical to D-72), Agfa/Ansco 103 Kodak D-52 (Selectol), Defender 51-D (Identical), Agfa/Ansco 135 Kodak Selectol Soft (no published Kodak formula) Agfa/Ansco 120 (very similar) Agfa/Ansco 125, similar but not identical to Defender 55-D Kodak D-73 Blue-Black developer, Defender 54-D is identical, Agfa/Ansco does not appear to have an equivalent. Each company had certain formulas which were not approximated by others (Agfa/Ansco 130 for example. -- --- Richard Knoppow Los Angeles, CA, USA |
#4
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GAF-125, very easy to be oxgenated
"Steven Woody" wrote in message ups.com... Richard Knoppow wrote: "Steven Woody" wrote in message ps.com... here is GAF-125 found in jack's photographic site which is said to be similar to kodak d-72, Water (125°F/52°C) 750 ml Metol 3 g Sodium Sulfite (anhy) 44 g Hydroquinone 12 g Sodium Carbonate (anhy) 65 g Potassium Bromide 2 g Cold water to make 1000 ml but i found, the stock solution is very easy to go brown, usually in 3 to 5 days. i think that is not normal and hope for some clues. thanks. - woody A correction to the above, the amount of Sodium Carbonate is for the monohydrated form, for anhydous carbonate reduce the amount to 54 grams. so, if i used 65g anhydous, that equals to 80g mono, that is exactly a Kodak d-72 (dekol), is it? thank you for telling me that, on the other hand, i don't care what i am using is a d-72 or gaf-125. This is not the problem, the stock solution will probably be a light straw color when mixed and should last about 6 months in a filled, closed bottle. do you mean the stock solution will last 6 months or the mixed working solution will last 6 months? The rapid oxidation may be due to the method used to mix the solution or perhaps to a defective ingredient. The Metol and Hydroquinone should be white or gray. A slight tan indicates some oxidation but it may still be OK. Neither should be brown. Make sure the Sodium Sulfite is not somthing else. because i also mix d-76d film developer, so i think the metol, hydroquinone as well as sodium sulfite is okay. To mix use water which has been boiled for about five minutes and allowed to stand undisturbed until cool. The boiling will drive off most dissolved gasses and also remove some minerals. i use distiled water but no boiling before mix. i will accept you advice but i am wondering if that can make such a big difference. Pour off the clear water slowly so that air is not forced into it. Dissolve the Metol first, Metol will not dissolve in a strong solution of Sulfite. It is sometimes suggested that a small amount of Sulfite be mixed first (about 15 grams per liter) to scavenge any gasses but the fist bit of Metol will do that. Once the Metol is dissolved add the sulfite and then the rest of the ingredients. Stir constantly when mixing but the stirring should not be so vigorous that it beats air into the solution. The stirring need only to be strong enough to keep the particles in suspension until they dissolve. Water temperature is normally given as 125F or 52C. However, if the ingredients will dissolve at a lower temperature its desirable to prevent decomposition. Do not use water hotter than 125F. Each ingredient should be completely dissolved before adding the next. Agfa/Ansco/GAF 125 is an intermediate strength paper developer. D-72/Dektol is stronger (more carbonate) and D-52 (Selectol) is much less active. Probably the closest other developer to No.125 is Defender 55-D although the two are not identical. Agfa's closest formula to D-72 is No. 103, which is nearly identical. Approximate equivalents a Kodak D-72 (Dektol), Defender 53-D (Identical to D-72), Agfa/Ansco 103 Kodak D-52 (Selectol), Defender 51-D (Identical), Agfa/Ansco 135 Kodak Selectol Soft (no published Kodak formula) Agfa/Ansco 120 (very similar) Agfa/Ansco 125, similar but not identical to Defender 55-D Kodak D-73 Blue-Black developer, Defender 54-D is identical, Agfa/Ansco does not appear to have an equivalent. Each company had certain formulas which were not approximated by others (Agfa/Ansco 130 for example. -- --- Richard Knoppow Los Angeles, CA, USA I suggested boiling in case you are using water with a lot of air in it. Boiling drives off the air. It might not make any difference but I was trying to list everything I could think of that could cause the trouble. I forgot, however, to ask about the container. What is it made of and how well does it seal? Also, was it thoroughly clean when you filled it. Some of this is pretty basic but its exactly the kind of thing that gets overlooked. The formula is very similar to several others that have long shelf life so its not the formula itself. My experience with Dektol is that it starts out slightly yellow and becomes darker yellow slowly with time. It should still be clear and only a somewhat darker yellow after several months. Eventually, Dektol and similar developers containing Hydroquinone will turn very dark brown and have a peculiar odor. I suggest mixing a small amount, perhaps 100ml, as a test. -- --- Richard Knoppow Los Angeles, CA, USA |
#6
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GAF-125, very easy to be oxgenated
ok, thanks for all your inputs, i will take your advices and see what
will happen next time. by far, i have one question left, after i dilluted one part of stock dektol with 2 part of water and keep the diluted working solution in a full glass bottle, how long is its shelf life? i ask this because the working solution shelf life of paper developer is more important to me than shelf life of stock solution. for example, if i need 1.5L working solution for 8x10 paper, so i can mix only and once a 500ml stock solution then make the 1.5L working solution, from then on, what i need to keep and stand on is the working solution rather than stock solution. you see, 1.5L can develop at least twenty-five 8x10 papers, so i don't want to waste it. thank you very much. - woody |
#7
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GAF-125, very easy to be oxgenated
"Steven Woody" wrote in message ups.com... ok, thanks for all your inputs, i will take your advices and see what will happen next time. by far, i have one question left, after i dilluted one part of stock dektol with 2 part of water and keep the diluted working solution in a full glass bottle, how long is its shelf life? i ask this because the working solution shelf life of paper developer is more important to me than shelf life of stock solution. for example, if i need 1.5L working solution for 8x10 paper, so i can mix only and once a 500ml stock solution then make the 1.5L working solution, from then on, what i need to keep and stand on is the working solution rather than stock solution. you see, 1.5L can develop at least twenty-five 8x10 papers, so i don't want to waste it. thank you very much. - woody Diluted developer has a quite short life. Kodak lists the life in a gallon tank as 2 weeks, you might get similar or longer life in a bottle. It would depend on how much air the developer is exposed to. In an open tray the life is about 24 hours. Anything that protects the developer from air will extend its life. -- --- Richard Knoppow Los Angeles, CA, USA |
#8
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GAF-125, very easy to be oxgenated
"Steven Woody" wrote in message ups.com... ok, thanks for all your inputs, i will take your advices and see what will happen next time. by far, i have one question left, after i dilluted one part of stock dektol with 2 part of water and keep the diluted working solution in a full glass bottle, how long is its shelf life? i ask this because the working solution shelf life of paper developer is more important to me than shelf life of stock solution. for example, if i need 1.5L working solution for 8x10 paper, so i can mix only and once a 500ml stock solution then make the 1.5L working solution, from then on, what i need to keep and stand on is the working solution rather than stock solution. you see, 1.5L can develop at least twenty-five 8x10 papers, so i don't want to waste it. thank you very much. - woody BTW, if you must economise on developer you might consider a slot processor like the Nova. These use relatively small amounts of processing solutions and expose relatively little of their surfaces to air. -- --- Richard Knoppow Los Angeles, CA, USA |
#9
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GAF-125, very easy to be oxgenated
Steven Woody wrote:
... 1.5L can develop at least twenty-five 8x10 papers, so i don't want to waste it. thank you very much. woody I processed my last 8x10s using 1/4 liter. As an experiment dilute a small amount or your stock 1:7. Pre wet the paper in the tray, drain, then pour in the 1/4 liter of 1:7. Because the developer is very dilute allow 5 minutes. Provide good agitation. Each print will have fresh developer. If all goes well your one liter of stock will then process 32 8x10s. I usually experiment using 5x7 paper in half that, 1/8liter. Plan your work ahead. If you've 4 8x10s to do a liter of 1:7 may be your way to go. Dan |
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