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#11
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Rodinal
On Sun, 21 Mar 2004 21:55:51 +0100, Andrew Price
wrote: On Sun, 21 Mar 2004 15:01:26 GMT, (Gary Beasley) wrote: In a thread elsewhere I read that a spray called Protectan to preserve developers consists of propane and/or butane. So if you have a butane refiller for cigarette lighters a quick squirt of that into the bottle after use does work to prevent oxygen from getting to the developer. It's true, it really does work. That being said, in my experience, Rodinal doesn't need treatment with Protectan. I agree with the others - it's one developer which seems to be virtually indestructible, no matter how long the bottle has been open. Actually I use nitrogen to displace the air, and I do see the difference in the Rodinal bottle, it doesn't turn brown by the time it's half empty like it did before I started using the nitrogen. For color chemicals this can be a lifesaver (not the round kind with the hole). ;-) |
#12
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Rodinal
In my experience Rodinol lasts almost forever. After about six months it
turns a dark rusty red, but still has no change in its developing power that I can see. I have used Rodinol well over a year old that worked as well as new. My standard film/developer combo is T-Max 100 developed for 11 minutes in Rodinol 1-100 @ 75º for normal development. Frank Rome, NY Gary Beasley wrote: On Sun, 21 Mar 2004 21:55:51 +0100, Andrew Price wrote: On Sun, 21 Mar 2004 15:01:26 GMT, (Gary Beasley) wrote: In a thread elsewhere I read that a spray called Protectan to preserve developers consists of propane and/or butane. So if you have a butane refiller for cigarette lighters a quick squirt of that into the bottle after use does work to prevent oxygen from getting to the developer. It's true, it really does work. That being said, in my experience, Rodinal doesn't need treatment with Protectan. I agree with the others - it's one developer which seems to be virtually indestructible, no matter how long the bottle has been open. Actually I use nitrogen to displace the air, and I do see the difference in the Rodinal bottle, it doesn't turn brown by the time it's half empty like it did before I started using the nitrogen. For color chemicals this can be a lifesaver (not the round kind with the hole). ;-) |
#13
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Rodinal
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#14
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Rodinal
I found a bottle of Rodinal that my friend's father had in the attic. After
35 years it developed like heaven. Moda "Alparslan" skrev i en meddelelse ... Hi all, Rodinal is not available in Turkey. I believe it is because in part Agfa's low profile marketing strategy. Anyway, I read a lot about Rodinal and decided to try it. I bought some rodinal in the U.S and am ready to give it a shot. It is half a liter bottle of Rodinal. I was hoping that it has a long shelf life like the T-Max developer I mainly use and bought the larger bottle. T-Max developer has a shelf life of 2 years in proper conditions. As I do not develop not more than 1-2 rolls of film in a week, shelf life is important to me. In the leaflet of rodinal, it says once the original bottle has been opened, the stock will keep for 6 months. I know Rodinal is very concentrated like the T-Max and I am wondering if keeping the stock rodinal in air tight brown glass bottles (trying not to leave any air in the bottles by moving the stock in smaller bottles as it is consumed) will help extend the life of stock rodinal over 6 months. I have another question. I use 300 ml of working solution to develop 35 mm. films. the 1+50 dilution requires really little amounts of stock developer. Is there a threshold for the stock amount to be used, any minumum limits? Thank you all for helping me. Kind regards, Alparslan |
#15
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Rodinal
"Alparslan" wrote in message news
In the leaflet of rodinal, it says once the original bottle has been opened, the stock will keep for 6 months. I know Rodinal is very concentrated like the T-Max and I am wondering if keeping the stock rodinal in air tight brown glass bottles (trying not to leave any air in the bottles by moving the stock in smaller bottles as it is consumed) will help extend the life of stock rodinal over 6 months. The 6 month limit is very conservative, even without moving into smaller bottles. I have another question. I use 300 ml of working solution to develop 35 mm. films. the 1+50 dilution requires really little amounts of stock developer. Is there a threshold for the stock amount to be used, any minumum limits? A figure of 5mL has been mentioned from time to time. Agfa used to have a pdf on their Australian web site which showed some contrast results using 1+100 with various Agfa and non-Agfa films at 15min and 20min dev time. Although some were quite low, some were useful. At the bottom of the pdf it says: "The 1+100 times are recommended for hand tanks only. There should be a minimum of 250mL solution for each film in the tank." That leads to 2.5mL per film. It is likely that developer exhaustion is playing a part in the low contrast results, but if 2.5mL gives almost ok results, then maybe 4mL could be tried if you want to minimise the consumption of the developer. |
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