Quote Originally Posted by Kirk Keyes View Post
I mean for both predicting and understanding why it happens.

When something that doesn't dissolve when it is believed that it should, well, maybe there's something missing in that original belief...

Is there anything you know about these (Ampholyte, Zwitterion, Isoelectric point) that specifically relates to Metol, Rodinal, or Developers in general?

That is, can you give some real world examples so we can learn something?
(I agree with the concept... but I don't have the skills just now to apply them to developers) can you show us what you mean with a practical example?