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Photo Forum / Film Photography / Darkroom / April 2004Rodinal
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 > Rodinal ... shelf life [?] Seems to be forever. Usable even when it has turned black. > 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) [?] Would be a waste of time and will not increase the shelf life as not one seems to have come up with a bottle of Rodinal that is so old it no longer works. > Is there a threshold for the stock amount to be used, any minumum limits? 11 ml/80 sq in => ll ml/36exp-35mm /120 /4-4x5" Success is reported at 7ml, anything lower and negatives get thin.  SignatureNicholas O. Lindan, Cleveland, Ohio nolindan@ix.netcom.com Consulting Engineer: Electronics; Informatics; Photonics. psst.. want to buy an f-stop timer? nolindan.com/da/fstop/ >>Rodinal ... shelf life [?] > [quoted text clipped - 7 lines] > one seems to have come up with a bottle of Rodinal that is so old it > no longer works. I had one of the plastic Rodinal bottles that leaked. Hydroxide spills are not fun. Bert > Success is reported at 7ml, anything lower and negatives get > thin. I mentioned a 10ml minimum a couple of years ago and was soon set straight. IIRC, 3ml give or take a little was bottom. Formulary Rodinal's minimum is 3.5ml. The only developing agent in Rodinal is p-aminophenal hydrochloride. Is that similar to metol? Do you think it might be activated by a carbonate? I wonder why it is not more used? Dan > I mentioned a 10ml minimum a couple of years ago and was soon set > straight. IIRC, 3ml give or take a little was bottom. Formulary > Rodinal's minimum is 3.5ml. > The only developing agent in Rodinal is p-aminophenal hydrochloride. > Is that similar to metol? Do you think it might be activated by a > carbonate? I wonder why it is not more used? Dan At high dilutions its an excellent choice. With certain films and the suggested higher concentrations it can produce contrasty negatives. Perhaps if Agfa published the detailed charts they do using 1+7 ? Using 1+50 less people would try and then perhaps intially dislike it. It can do beautiful things, I say go for the Carbonate....let us know !!! Maybe try it with Metaborate ? BoraX? SignatureLF website http://members.bellatlantic.net/~gblank > > I mentioned a 10ml minimum a couple of years ago and was soon set > > straight. IIRC, 3ml give or take a little was bottom. Formulary [quoted text clipped - 4 lines] > > At high dilutions its an excellent choice. [...] In fact, at 1:200 in a tank with all the reels full of film, _all_ films develop to approximately N-1 to completion using the same developing time: any time over 50 minutes. > In fact, at 1:200 in a tank with all the reels full of film, _all_ films > develop to approximately N-1 to completion using the same developing time: > any time over 50 minutes. Crap. I'm such a dummy. That's "all _but perhaps TMax films_ develop in the same time at 1:100 for 50 minutes." I haven't tried TMax. I use Agfa films. john@xyzzy.stafford.net (jjs) wrote in message news: .... > Crap. I'm such a dummy. That's "all _but perhaps TMax films_ develop in > the same time at 1:100 for 50 minutes." I haven't tried TMax. I use Agfa > films. Agfa used to publish a sheet of development data for many films (Agfa and non-Agfa) developed for 15 and 20 min in Rodinal 1+100. For 15min, gamma ranged from 0.45 (HP5+, FP4+ and APX100) to 0.65 (Tri-X). For 20min, gamma ranged from 0.50 to 0.68 For some films, there was minimal or no contrast increase from 15 to 20 min. Maybe there is practically no difference between 20 and 50 minutes. They recommended at least 250mL of developer for each film. Maybe using more would lead to more contrast since developer exhaustion is likely to be a limiting factor. The table must have been prepared some time ago, as it listed Pan F separately from PanF+, and Panatomic-X. It did however include later films like the TMax and DElta films, so it probably included info from different dates. If you can't find it, can someone suggest where I could upload it to so that people could have a look at it? >Hi all, > [quoted text clipped - 13 lines] >stock in smaller bottles as it is consumed) will help extend the life of >stock rodinal over 6 months. 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. The person doing the experiment has tried it on developers that discolor as they oxidised and reports the developer was perfectly clear after 6 months of storage. Use all precautions for flammable materials when using this. I use gas lighter refill. It's better in a glass botlle or some plastic ones. The brown bottles I have are not as good as the blue ones (you can tell by how much they collapse - no or little collapse means air has penetrated through the walls/cap). Jorge >>Hi all, >> [quoted text clipped - 22 lines] > clear after 6 months of storage. > Use all precautions for flammable materials when using this. >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. >>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 [quoted text clipped - 6 lines] >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). ;-) 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 > >>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 [quoted text clipped - 12 lines] > color chemicals this can be a lifesaver (not the round kind with the > hole). ;-) I found a bottle of Rodinal that my friend's father had in the attic. After 35 years it developed like heaven. Moda > Hi all, > [quoted text clipped - 21 lines] > > Alparslan "Alparslan" <berika.remove@egenet.com.tr> 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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