Rodinal contain only PAP.Na salt Sodium Aminophenolate with formula C6H4ONaNH2. But isn't important how we obtain it. From base or from HCl or H2SO4 salt.I repeat Rodinal does not contain p-aminophenol hydrochloride, so that's not the correct formula, it has no chloride of any form.
Yes the presence of Chloride alters the developer slightly. Enough for Andressen to use the free base in Rodinal.
less than 1g/l of NaCl isn't important, be sure. all my post and formulas is correct. but question is other - why we have two different formulas of EZ-Rodinal
Andresen felt differently which is why Rodinal has no Chloride, it's enough to have a slight effect as these are equilibrium equations.
Agfa and Andressen make a point of stating Rodinal contains only the free base in his publications so any formula based on the hydrochloride is not the same as Rodinal.
Ian
30g/l in diluted Rodinal?I think I use 30g/liter IIRC
Off topic, but the rumor that the sodium form of PaRodinal has a short life is not true:There are many instances of only sodium being prescribed. These formulas are 20% deficient in active developer, and die quickly (+- 3 months).
30 g/l NaCl was supposedly used in Microdol for fine grain at the expense of emulsion speed. Note that Microdol X used an extra compound to avoid dichroic fog, so it would be interesting to know whether you ever ran into that issue with modern film.I also put sea salt (no Iodine) in Rodinal at times to kill some of the graininess with some films. It works fine. I think I use 30g/liter IIRC. It seems to lose some speed though which makes sense. From what I remember reading the salt acts on the exposed silver somehow to limit infectious development giving the finer grain. Some of the old fine grain formulas used salt.
30 g/l NaCl was supposedly used in Microdol for fine grain at the expense of emulsion speed. Note that Microdol X used an extra compound to avoid dichroic fog, so it would be interesting to know whether you ever ran into that issue with modern film.
In a high pH developer like Rodinal which is essentially non-solvent to begin with I can't see how adding 30g/L NaCl would provoke dichroic fog.
I read when your solution finally cleared it was pinkish./QUOTE]
If this a reference to chakra's solution just bear in mind that we haven't seen him on Photrio for over 4 years
pentaxuser
Those in the know, what is Agfa P.1347 antifoggant, I mean actually is it known or is that the one "secret" ingredient Agfa took to grave?In support of Ian here is an old formula for Rodinal. This is the formula which was collected from the Agfa Wolfen plant in 1945.
Distilled water ………………………………………………………………… 340 l
Paraminophenol …………………………………………………………………… 34 kg
Potassium sulfite, 30% w/w at 55°C ……………… 558 kg
Potassium hydroxide, 34% w/w………………………………… 50 kg
Potassium bromide ………………………………………………………… 5.52 kg
Agfa P.1347 antifoggant …………………………………………… 42 g
As you can see the free base was used NOT the hydrochloride salt.
https://www.photrio.com/forum/threads/c-41-colour-film-and-the-orange-mask.45189/page-3#post-1860453Those in the know, what is Agfa P.1347 antifoggant, I mean actually is it known or is that the one "secret" ingredient Agfa took to grave?
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