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#41
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Rodinal
Patrick Gainer wrote:
A little off topic, but did you fellows hear about the joker who almost got some city council to ban the use of paper cups containing dihydrogen monoxide? It was described as a colorless, tasteless, odorless liquid that could be fatal if inhaled. Yeah, it was a school project that was to test gullibility. :-) |
#42
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Rodinal
Patrick Gainer wrote: jjs wrote: In article , wrote: Someone sugested using the medicine measuring syringes that look like a hypodermic and come with a soft plastic stopper with a hole in it. I trim one of these till only one ring protrudes from the bottle and drill a hole in the bottle's screw cap to let the nozzle come through, then screw the cap on permanently. I leave the syringe in the stopper between times as a seal. This is convenient. Can't picture it, but there are plastic 'accordian' shapped syringes intended specifically for chemicals. They aren't stoppers. They let oxygen into the bottle. Beware if that's what you are using. Not to brag or anything but my developer stock solutions are not affected by oxygen. I've not seen any evidence except color change that Rodinal is either. I'm sloppy enough to have seen it, I assure you. I should have specified currently concocted stock solutions, the ones with no water. |
#43
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Rodinal
On 24 Mar 2004 14:30:57 -0800, (Dan Quinn) wrote:
Unless that is, the public formula is seven times the strength. I believe the original formula was published around 1905 Water @ 125F 750ml p-Aminophenol Hydrochloride 100g Pot. metabisulfite 300g Water to make 1.0L 50% Hydroxide Solution Water @ 65F 75ml Sod. Hydroxide 50 Water to make 100ml From my site of course ;) Regards, John S. Douglas, Photographer - http://www.darkroompro.com Please remove the "_" when replying via email |
#44
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Rodinal
On 24 Mar 2004 23:27:54 -0800, (Dan Quinn) wrote:
Public domain "Rodinal" is NOT even close to Agfa's Rodinal. Dan I would say that it is close but not identical. As Michael noted, the distributed version is very basic which indicates that it may have less bisulfite in it. Regards, John S. Douglas, Photographer - http://www.darkroompro.com Please remove the "_" when replying via email |
#45
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Nix Glass Rodinal? (was Rodinal)
On Wed, 24 Mar 2004 09:08:12 -0600, (jjs)
wrote: Thanks for that, and your other post, Dan. I had an awful time finding small glass bottles. Even the pharamcists quit using them. So I ordered from Boston Round and by your post it appears that I guessed well. Why not just use the 250~300 ml plastic cough syrup bottles that any pharmacy has ? I believe that most are made of PET which is an excellent storage medium. Regards, John S. Douglas, Photographer - http://www.darkroompro.com Please remove the "_" when replying via email |
#46
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Nix Glass Rodinal? (was Rodinal)
On Thu, 25 Mar 2004 02:50:52 -0600, (jjs)
wrote: Recycled may have been a better word. Recycled will likely contain more impurities. [...] I'll never drink Heinekin again. They just add to the flavor ;) Regards, John S. Douglas, Photographer - http://www.darkroompro.com Please remove the "_" when replying via email |
#47
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Rodinal
Besides, the MSDS cites pot. bromide, not in the public formula.
But this could have been one of those small changes - more alkali, put some bromide to avoid fog. Jorge John wrote in : On 24 Mar 2004 23:27:54 -0800, (Dan Quinn) wrote: Public domain "Rodinal" is NOT even close to Agfa's Rodinal. Dan I would say that it is close but not identical. As Michael noted, the distributed version is very basic which indicates that it may have less bisulfite in it. Regards, John S. Douglas, Photographer - http://www.darkroompro.com Please remove the "_" when replying via email |
#48
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Nix Glass Rodinal? (was Rodinal)
In article , John
wrote: On Thu, 25 Mar 2004 02:50:52 -0600, (jjs) wrote: Recycled may have been a better word. Recycled will likely contain more impurities. [...] I'll never drink Heinekin again. They just add to the flavor ;) You are the man to ask: Have you noticed that Rodinal concentrate looks just like Guinness? Did you discover it the hard way? |
#49
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Nix Glass Rodinal? (was Rodinal)
On Thu, 25 Mar 2004 19:05:57 -0600, (jjs)
wrote: You are the man to ask: Have you noticed that Rodinal concentrate looks just like Guinness? Did you discover it the hard way? Ummmm, now that we have children, I tend towards something a little more caffeinated. To all of those that warned to get some sleep, YOU WERE SO RIGHT !! And yes, Rodinal does remind me of coffee ;) Regards, John S. Douglas, Photographer - http://www.darkroompro.com Please remove the "_" when replying via email |
#50
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Rodinal
John wrote
I believe the original formula was published around 1905 Water @ 125F 750ml p-Aminophenol Hydrochloride 100g Pot. metabisulfite 300g Water to make 1.0L 50% Hydroxide Solution Water @ 65F 75ml Sod. Hydroxide 50 Water to make 100ml From my site of course ;) Nice site but where are the galleries? One other formula of a Rodinal type has been posted this thread. Perhaps you saw it: 20gr p-AM, 60gr metabisufite, and 28gr KOH per 400ml. A complete discription of it's compounding is included. Contrast that mix with Formulary's 50gr, 150gr, and 215gr per 1000ml. On a liter basis the above posted formula has 70gr of KOH. Where does the Formulary and Jacks Pic come up with 215gr? Am I over-looking something somewhere? I've not done the arithmatic yet but would not be surprised if the 70gr gives the 3% KOH Agfa claims on their bottle. Dan |
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