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#11
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Warm tone papers and developers
"Bogdan Karasek" wrote in message ... Hi, What should I know about this Agfa 120? It can't be available anymore since Agfa gave up on us, unless you have a stash. The warm tone developer I use is AGFA Neutal WA. I'm down to my two 500ml bottles Neutal WA. For me Neutal WA and Agfa Classic and 1:9 Selelium is the wand for making magic. Now Agfa is kaput. Have to get a new wand Cheers, Bogdan Lew wrote: The instruction sheets for the two papers I'll be trying (Arista & Forte) recommend Dektol, why not a warm tone developer (like Agfa 120)? Also, I goofed and mixed the120 with sodium, not potassium carbonate. Will this make a big difference? -LS -- __________________________________________________ ________________ Bogdan Karasek Montr‚al, Qu‚bec e-mail: Canada Agfa/Ansco 120 is not so much a warm tone developer as a "soft" developer, meant to produce somewhat lower contrast than standard developers. I employs Metol as the sole developing agent. Kodak Selectol Soft is probably nearly identical. Most warm tone developers, like Kodak D-52, are simply less active than neutral/cold tone ones like Dektol/D-72. However, there are some special developers, like the Agfa Hydroquinone and Hydroquinone and Glycin developers I posted a day or so ago, that produce noticably warmer tones than the low activity ones. I am pretty sure Neutol WA is one of these but can't be sure because Agfa MSDS often leave out some ingredients. If you can mix your own, and can obtain Glycin, I suggest trying Agfa/Ansco 115, which I posted earlier. If you can't find it I will post again or send it to you via e-mail. As far as commercially packaged developers, Ilford now has a warm tone and a cold tone developer sold under the Harmon name. I have no idea of what is in these but they are certainly worth a try. Check the Ilfordphoto web site for details. -- --- Richard Knoppow Los Angeles, CA, USA |
#12
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Warm tone papers and developers
When the hydroquinone only formula I posted earlier in this thread made no
discernable difference in my neutral toned paper, I added more carbonate to shorten the developing times & now I can't tell the difference between it and Dektol. (Begging the question: what does metol do?) -LS "Richard Knoppow" wrote in message ink.net... Agfa/Ansco 120 is not so much a warm tone developer as a "soft" developer, meant to produce somewhat lower contrast than standard developers. I employs Metol as the sole developing agent. Kodak Selectol Soft is probably nearly identical. Most warm tone developers, like Kodak D-52, are simply less active than neutral/cold tone ones like Dektol/D-72. However, there are some special developers, like the Agfa Hydroquinone and Hydroquinone and Glycin developers I posted a day or so ago, that produce noticably warmer tones than the low activity ones. I am pretty sure Neutol WA is one of these but can't be sure because Agfa MSDS often leave out some ingredients. If you can mix your own, and can obtain Glycin, I suggest trying Agfa/Ansco 115, which I posted earlier. If you can't find it I will post again or send it to you via e-mail. As far as commercially packaged developers, Ilford now has a warm tone and a cold tone developer sold under the Harmon name. I have no idea of what is in these but they are certainly worth a try. Check the Ilfordphoto web site for details. |
#13
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Warm tone papers and developers
On Mon, 27 Mar 2006 08:02:55 -0500, "Greg \"Blank\" - Lizard King."
wrote: In article , Now Agfa is kaput. Have to get a new wand Cheers, Bogdan Formulate. These companies should be made to publish their older information to the web so that it would be accessible but instead their taking their technologies to their graves. == John S. Douglas Photographer & Webmaster www.legacy-photo,com www.xs750.net |
#14
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Warm tone papers and developers
On Tue, 28 Mar 2006 22:59:31 -0500, "Lew" wrote:
(Begging the question: what does metol do?) It help initiate the development (reduction) cascade. It also enables processing at lower temperature than possible with most other chemicals. Lastly, it help develop film speed by raising the to of the film. == John S. Douglas Photographer & Webmaster www.legacy-photo,com www.xs750.net |
#15
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Warm tone papers and developers
"John" wrote:
These companies should be made to publish their older information to the web so that it would be accessible but instead their taking their technologies to their graves. Ah ha! Exactly! To keep manufacturing secrets from going to the grave the Lord created patents. The inventor has to tell all to get protection. The inventor would get no protection if the government [that's us] could get away with it and patents don't exist in communist countries. It is a myth that the patent system is there to protect the noble inventor from the cruel world. There would be no secret syrup for making Coke if it had been patented. |
#16
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Warm tone papers and developers
"Nicholas O. Lindan" wrote in message ink.net... "John" wrote: These companies should be made to publish their older information to the web so that it would be accessible but instead their taking their technologies to their graves. Ah ha! Exactly! To keep manufacturing secrets from going to the grave the Lord created patents. The inventor has to tell all to get protection. The inventor would get no protection if the government [that's us] could get away with it and patents don't exist in communist countries. It is a myth that the patent system is there to protect the noble inventor from the cruel world. There would be no secret syrup for making Coke if it had been patented. Patents were intended to make technical developments public after a time by allowing the inventor to have a monopoly for a relatively short time. In the US its 17 years from the date of issuance although there is some protection as soon as a patent is applied for. Under some circumstances current patents can run for 20 years. One can also protect a process or mechanism as a trade secret. There is a considerable body of law about trade secrets so they are actually afforded considerable protection. The decision as to whether to patent or not depends on the expected life of an idea. For instance, in the past, film manufacturers kept the exact details of emulsion making extremely secret. About 40 years ago the rapidity of the development of new techniques and methods led them to patent such information because it was not expected to be useful much beyond the patent life. It _is_ possible to get around a trade secret but not a patent. -- --- Richard Knoppow Los Angeles, CA, USA |
#17
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Warm tone papers and developers
"Lew" wrote in message t... When the hydroquinone only formula I posted earlier in this thread made no discernable difference in my neutral toned paper, I added more carbonate to shorten the developing times & now I can't tell the difference between it and Dektol. (Begging the question: what does metol do?) -LS "Richard Knoppow" wrote in message ink.net... Snipping... Metol is a very efficient electron transfer agent. Hydroquinone by itself is a very low activity developer. When used at quite high pH it is suitable for very high contrast developers but cab be a fine grain (and brown tone) developer at lower pH provide one is willing to deal with the great emulsion speed loss caused by its inefficiency. In most Metol-Hydroquinone formulas the Metol is the primary developing agent. The two agents in combination are super-additive over a range of pH, meaning the resulting densities are greater than either agent would produce by itself. The combination also has a mutual regenerating effect. At low pH, as in D-76, the regenerating effect exists but the super additive effect does not. D-76 is nearly as effective with the Hydroquinone left out. Metol, OTOH, works well by itself and is an effective developer even at neutral pH (as in D-25). -- --- Richard Knoppow Los Angeles, CA, USA |
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