Kalogen, a less-known developer
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John Bragg
Well-known
Nice work. How did you discover the formula and history of this forgotten brew ? It looks like a decent general purpose developer. I know it was intended to replace Rodinal during hostilities of the First World War.
sevo
Fokutorendaburando
A Rodinal substitute? That is a bit of a odd claim, as neither its chemistry nor its properties are even remotely related. Kalogen is one of many formulas for MHQ developers published in books of the era. Quite similar to D-76 except for sodium hydroxide in place of borax and some more inhibitors. I have mixed the corresponding Agfa recipe (Agfa 40) - which was pretty good for Efke sheet film, but D-76/ID-11 work at least as well where our modern films are concerned.
tho60
Well-known
My story is quite interesting. At first, I wanted to brew some Parodinal, but I could not purchase pure paracetamol powder for a while. So I looked for a formula which is good for one-shot developers. I have found "Kalogen" in the internet, but there are many variations.
In the beginning, based on these formulas, I created my own version, the KT-74, and then I mixed the original. http://notesonphotographs.org/index.php?title=Kalogen
Finally, I bought pure paracetamol powder and brewed Parodinal as well, not yet I made the pill-based version of it.
I guess that Kalogen and even more KT-74 is contrast working developer, since the sodium-hydroxide stimulates hydroquinone extremely.
tho60
Well-known
Kalogen is a highly-concentrated developer intended for one-shot use after dilution and long shelf-life. In this sense, Kalogen and Rodinal are familiar.
Agfa/Orwo 40 and Kalogen are not similar, since Agfa 40 does not contain sodium-hydroxide and is not highly-concentrated.
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sevo
Fokutorendaburando
The recipe I have mixes to 1l, at a agent concentration not that far off D76 - there must be many variations around. Besides, the most relevant property of Rodinal isn't its packaging, or we'd have to consider HC-110 "the most popular Rodinal substitute and successor".
You are right. Worse, at closer inspection the supposed 40 on my recipe note is a 46 - which does not contain hydroxide either (it is the sodium carbonate variation of 40).
KevinVH
Nikonian!
That's a pretty toned negative! Well done!
tho60
Well-known
Check for the above mentioned link:
http://notesonphotographs.org/index.php?title=Kalogen
and then
http://notesonphotographs.org/index.php?title=Rodinal
Based on the provided information in these links, you can easily compare Kalogen and Rodinal.
tho60
Well-known
Kt-9
Kt-9
Some days ago I brewed a metol-based highly concentrated developer. This is the formula: 5 g metol, 15 g potassium-metabisulphite, sodium-hydroxide enough to clear the precipitation.
The negs developed in 1:50 solution (8 minutes) look fine.
Kt-9
Some days ago I brewed a metol-based highly concentrated developer. This is the formula: 5 g metol, 15 g potassium-metabisulphite, sodium-hydroxide enough to clear the precipitation.
The negs developed in 1:50 solution (8 minutes) look fine.
tho60
Well-known
The above mentioned weights are valid for 100 ml. Of course, for 1 liter take ten times amounts.
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