Oxidation is only part of the issue. Heat plays a large roll as well. I use D76 in those brown plastic bottles from Freestyle, as well as a couple of accordion plastic bottles. This works fine, but 4-5 weeks is all I'll go w/ this developer. I like the wine bottle idea (any excuse to buy more vino rosso is a good one). Don't have any caps for them though, and I had no success trying to just put a cork in a bottle full of developer, so for now the bottles are for a nice decorative display.