There are three ways to arrive at the same rodinal concentrate. You can start with potassium sulfite, potassium bisulfite, or potassium metabisulfite. You start with an amount of hydroxide needed to create the phenolate salt of paraminophenol. Then each sulfite requires a different amount of potassium hydroxide but the end product is always the same.
If you want real rodinal then you cannot use drain clearer (lye). The potassium compounds are more active photographically than their sodium equivalents. So stick with the potassium ones across the board. For reasons I have never been able to figure out the potassium salts are cheaper and easier to obtain in Europe. That is why I have never been particularly fond of the homebrew versions made here in the US. Last I looked potassium hydroxide was available from The Chemistry Store.
http://www.chemistrystore.com/
There are quite a few rodinal-like developer formulas. But they all have basically the same formula. Per liter of concentrate they contain the equivalent of 50 g of paraminophenol base. For a good recipe follow the following link.
(there was a url link here which no longer exists)
