Originally Posted by Ian Grant
It's not really similar at all, (well not to any form of Rodinal)
The Sulphite content is more than ten times higher and the pH is close to 7 whereas old Classic/Rodinal must be nearer 9-10 (that's a very quick guess, but it should be roughly 11.8 before dilution).
It does show quite nicely how Kodak switched techniques though to high sulphite levels for fine grain
Similar only Ian.
It is, of course, lower in pH and higher in sulfite, but it is basically Metol and Sulfite which is an analog of Rodinal and Patrick's formula in substance and probably somewhat in function.