Parrodinal/Rodinal formulas proven true

Recently I discussed using KOH for these two formulas and it generated so wildly differing opinion.

Just to create content for a sticky, what formulas for a one liter jar do you use and can justify as close to the original formula?

Cheers,
Eli

For a long time now, commercial Rodinal has used potassium sulfite and KOH. Using a potassium-based formula allows for much higher concentrations than sodium-based ones.
Because someone, somewhere, decided that the world would end if potassium sulfite fell into the hands of an ordinary person, it’s banned from sale and under strict regulation, except perhaps in China… For a Parodinal variant, you can use KOH; this will make the solution mixed, but it will significantly improve the limits of saturation. And if you decide to go deeper, you can remove sodium sulfite entirely and replace it with the molar equivalent of potassium metabisulfite plus KOH, which will give you a Rodinal-like slurry, but with a large excess of KOH (inevitable with Parodinal).
If you just want to replace NaOH with KOH, simply multiply the required amount of NaOH by 1.4 and substitute it with KOH.

I found this to work OK. It did begin to deposit crystal after about a year, it may be that the solution is supersaturated with aminophenolate.

Is there any reason for DIY Rodinal to be of the same concentration as the original? Doubling the volume of the concentrate by using additional water should address solubility issues of Sodium version and also avoid precipitation. Does the shelf life go down if this approach is taken?

It was originally formulated a long time ago by a guy called Sreenath. He did not disclose why the quantity of sodium sulfite was chosen. It may work just as well with an amount that dissolves although the presence of some crystals of sodium sulfite would presumably extend its shelf life.