I've tried the two bath a few years ago but was not so happy with the results. I thinks I'll have to try again since everybody seems to like it.I like D-23 a lot. Soon I will be trying the two-bath D-23 by Barry Thornton.
Benzotriazole, %1
Hmm! I don't know, but I've mixed the recipe exactly how Gerald wrote it, and it worked perfect. I've not had a problem of making a 1% solution of Benzotriazole? You do have to heat the water to about 150F degrees.Should be 0.1%. The solubility of benzo is too low to attain 1%.
Hmm! I don't know, but I've mixed the recipe exactly how Gerald wrote it, and it worked perfect. I've not had a problem of making a 1% solution of Benzotriazole? You do have to heat the water to about 150F degrees.
Should be 0.1%. The solubility of benzo is too low to attain 1%.
It can be mixed into Alcohol or Glycol to create a 1% solution which in this case is omitted.
True, its solubility is much higher in alcohol. However, if the solution is to be made in something other than water, it should be specified. Frankly, when mixing the above formula, it would be easy enough to just mix in the 0.5g.
It's odd another source for a formula (Digital Truth) is more concentrated in terms of developing agents and doesn't even include benzotriazole. Although, the difference between 0g/L and 0.5g/L of benzo might not be that significant, diluted down 1/50.
The formula listed here is an improved version
This was a rabbit hole.
Everywhere you look, there are variations of this formula. Some guy on Flickr cites references to numerous 125-year-old journals as the origin, but no direct links. When I search those journals, I find no such thing (fun looking, though). The oldest reference is Paul Anderson's Pictorial Photography in 1917, where it's unnamed.
View attachment 363357
No benzotriazole and the amounts convert to the amounts given at Digital Truth.
Anyway, my only concern was people trying to make a 1% solution of benzo in water. And in the other thread, it seems like benzo as a powder won't dissolve in the formula directly.
If benzo is to be used when this is diluted for paper use, it would be sensible to have a half-litre of 0.1% benzo in water to add at that time, rather than in the Kalogen stock. The reduced bromide is likely inconsequential with fresh film.
Now I just keep Kalogen on hand
Yes, it's really a pretty potent developer for both film and paper. The real reason I started experimenting with Kalogen to see if it would work alright for me was I needed a handy developer in a small package with excellent or good shelf life. That was because I'm constantly going back and forth between my cottage and home and bringing my gallon + replenisher of Xtol was out of the question. Now I can cart one tiny bottle of Kalogen and two small bottles of Pyrocat-HDC A and B. That way I have things covered very well. Is Kalogen perfect? No, but it's pretty darn good enough for me.It does seem to be a valuable thing to have.
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