Quote Originally Posted by Gerald C Koch View Post
A replenished developer system recycles most of the developer after use. An amount of either a specific replenisher or fresh developer is added to maintain the developer's strength. An example would be D-76 used with replenisher D-76R. It's economical but there is some change in the developers action after each replenishment cycle. People tend to either love the idea or hate it.
But what is actually happening on a chemical level with these marketed replenishers. Is it an alkali to get the PH back up where it should be? Are there compounds that react with redox byproducts and clear them up or sludge them out? Or is it just a fresh jolt of whatever the reducer was?