Quote Originally Posted by Bob-D659 View Post
Purging the Kodak concentrate bottles with argon/nitrogen extends their life well over a year. BTDT, have the nice prints to prove it too.

Yes keeping the mixed chems in recycled pop/water bottles with the air squeezed out has them keeping for at least 7 months. I have some mixed last august that I use for testing once a month, they are still good.
This may be true if you are lucky, but the developing agent is not packed under an inert atmosphere, but rather under a mix of inert gas and Sulfur Dioxide. When you open the bottle the first time, you smell this excess SO2 gas.

Once lost, the developing agent part begins to go bad much more rapidly than otherwise, and the final solution can lack some sulfite.