Quote Originally Posted by Photo Engineer View Post
Well, after some literature searching I find that you probably will not be able to make a stable Rodinal like concentrate from Metol. It is more active than pAP, enough so that the concentrate will probably not keep. Otherwise, the two compounds are quite similar differing only in the N-methy group in Metol.

And the form of the salt

Only Edmund Lowe used the sulphate form of p-Aminophenol