Quote Originally Posted by Gerald C Koch View Post
I have made various rodinal type developers. From my personal experience an excess of hydroxide shortens the shelf life of the developer.
That's true however before WWII Agfa were testing long chain wetting agents and patened some which they found to have unexpected anti-oxidising properties. One of these is used in later versions of Rodinal, it was being used during WWII.

This is one reason why the Agfa version of Rodinal with it's excess Hydroxide has better keeping properties than the Calbe RO9 developer.

Ian