My wife gave birth last October and things have been so hectic I haven't been in the dark since. Things are getting easier now and I'm making plans to print some of my massive backlog of films. I just checked my RA4 chemistry and noticed that the bottle of colour developer B I keep in the fridge has gone bad, I checked my two unopened bottles and both of those are bad too. I found the receipt from when I bought them and it's December 2009. I suppose the chemicals were at least a few months old before I got them so maybe Colour developer B has lasted 2 1/2 years, maybe 3 years. Does this sound like a reasonable shelf life? Any tips for extending it? Now I need to buy another case which I can't afford - we had so many bills to pay this month I can't even afford the APUG subscription until late April. Would be nice to be able to buy single bottles of Developer B.