For those who are interested in making their own Rodinal type developer for personal curiosity, here is a simplified formula designed by Patrick Gainer.
http://www.apug.org/forums/viewpost.php?p=398138
Rodinal, its true story and formula.
Moderator: Keith Tapscott.
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- Location: Plymouth, England.
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Re: Rodinal, its true story and formula.
Thank you, Keith. I enjoy reading about Rodinal.
Re: Rodinal, its true story and formula.
Rodinal is the Tim Tebow of developers.
Everybody thinks it's better than than it is, and won't stop talking about it.
LOL
Everybody thinks it's better than than it is, and won't stop talking about it.
LOL
Re: Rodinal, its true story and formula.
Ornello is correct, that people think that Rodinal is better than it exactly is. That is because it is.
I was doing some testing of a few old developers in my lab, that I was thinking about trashing. So I pulled out my listing on these samples and began to look at them closely.
Pyro and Pyrocat will not last long in a sodium sulfite and sodium carbonate solution. So I toss them out because they were dead. And if you use sodium hydroxides in them they will die even faster.
But what if we did this.
1oz of Rodinal
20ml of Pyro, mixed 10 grams into 2 oz of boiled water
10ml of Borax mixed 10grams into 2 oz of boiled water
diluted 1:80 developed 10 minutes in a tray from my 6 X 9 Speed Graphic. And it came out bitchin.
Because the Rodinal had the p-aminphenol HCI, sulfite, and hydroxide, I added the pyro, and the borax. So basically I made RPK
R= Rodinal
P= Pyro
K= Kodalk..., by adding the borax
Well I am tired now, so I will take a nap, and do some more testing after turkey day.
Thank You
KennyE
I was doing some testing of a few old developers in my lab, that I was thinking about trashing. So I pulled out my listing on these samples and began to look at them closely.
Pyro and Pyrocat will not last long in a sodium sulfite and sodium carbonate solution. So I toss them out because they were dead. And if you use sodium hydroxides in them they will die even faster.
But what if we did this.
1oz of Rodinal
20ml of Pyro, mixed 10 grams into 2 oz of boiled water
10ml of Borax mixed 10grams into 2 oz of boiled water
diluted 1:80 developed 10 minutes in a tray from my 6 X 9 Speed Graphic. And it came out bitchin.
Because the Rodinal had the p-aminphenol HCI, sulfite, and hydroxide, I added the pyro, and the borax. So basically I made RPK
R= Rodinal
P= Pyro
K= Kodalk..., by adding the borax
Well I am tired now, so I will take a nap, and do some more testing after turkey day.
Thank You
KennyE
Last edited by KennyE on Wed Dec 18, 2013 10:11 am, edited 1 time in total.
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- Posts: 551
- Joined: Tue Jan 17, 2006 8:58 am
- Location: Plymouth, England.
Re: Rodinal, its true story and formula.
Pyro is not stable when stored in alkaline conditions. Why would someone use sulphite or carbonate solutions for Pyro?KennyE wrote: Pyro and Pyrocat will not last long in a sodium sulfite and sodium carbonate solution. So I toss them out because they were dead. And if you use sodium hydroxides in them they will die even faster.
KennyE
Re: Rodinal, its true story and formula.
Keith, hello and how are you?
After re-reading my post, I discovered where I had made it confusing to understand my actions and ideas.
What I did was to take 1 oz. of my home brewed Rodinal and diluted it 1:80, and to it, I added the concentrated amounts of Pyro and Borax. What I had was an A, B, C formula of Rodinal, Pyro, and Borax.
I knew that Pyro does not last long in sulfite and carbonate solutions, and I became upset with myself, for leaving the mixtures around in my lab. So in cleaning up my lab..., I remembered that Rodinal, does not do well with Borax, if left in a mixed solution longer than 4 to 6 hours, the chemical solution will start to break down, and with the same being true with Pyro. Unless the solutions are highly diluted with water, which then will lengthen the time to about 8 plus hours. before the solutions are totally worthless.
So I made two separate solutions, one Pyro and the other Borax, and mixed them with the diluted Rodinal. The Rodinal needed to be diluted first, before adding the Pyro and Borax. Because unlike PMK, the sodium hydroxide and borax are not pre-mixed and I did not want the chemical reaction that takes place when one prepares PMK.
Since Rodinal already contains the hydroxide, I just needed to add the Borax to give me the Sodium Metaborate effect I wanted; about 10 ml. Then I add 20 ml the Pyro to get my p-Amino/Pyro combination I wanted.
This gave me even better results, because I believe that the borax helped to reduce the grain levels and improve edge effect and sharpness. Plus by controlling the amounts of Pyro and Borax levels independently, one may obtain a varying degree of results. In fact, I think that the amount of borax that I added was too low. So I will increase it by 2 ml enactments until I get the results that pleases me.
Thank You
KennyE
After re-reading my post, I discovered where I had made it confusing to understand my actions and ideas.
What I did was to take 1 oz. of my home brewed Rodinal and diluted it 1:80, and to it, I added the concentrated amounts of Pyro and Borax. What I had was an A, B, C formula of Rodinal, Pyro, and Borax.
I knew that Pyro does not last long in sulfite and carbonate solutions, and I became upset with myself, for leaving the mixtures around in my lab. So in cleaning up my lab..., I remembered that Rodinal, does not do well with Borax, if left in a mixed solution longer than 4 to 6 hours, the chemical solution will start to break down, and with the same being true with Pyro. Unless the solutions are highly diluted with water, which then will lengthen the time to about 8 plus hours. before the solutions are totally worthless.
So I made two separate solutions, one Pyro and the other Borax, and mixed them with the diluted Rodinal. The Rodinal needed to be diluted first, before adding the Pyro and Borax. Because unlike PMK, the sodium hydroxide and borax are not pre-mixed and I did not want the chemical reaction that takes place when one prepares PMK.
Since Rodinal already contains the hydroxide, I just needed to add the Borax to give me the Sodium Metaborate effect I wanted; about 10 ml. Then I add 20 ml the Pyro to get my p-Amino/Pyro combination I wanted.
This gave me even better results, because I believe that the borax helped to reduce the grain levels and improve edge effect and sharpness. Plus by controlling the amounts of Pyro and Borax levels independently, one may obtain a varying degree of results. In fact, I think that the amount of borax that I added was too low. So I will increase it by 2 ml enactments until I get the results that pleases me.
Thank You
KennyE