Hurray! I need some antibiotic plates for a bacterial transformation later on in the day, but found out that a) the plates I have are getting on for 6-weeks old, b) I didn't have any bottles of sterile media made up, and c) there was no bacto-agar left. So I had a quick online rummage of Bitesized Bio, a site where scientists exchange technical tips and flag up new techniques, to see what the BBD (best-before date) for antibiotic plates were. My old supervisor always said 1 month, but it appears that my 6-week old veterans don't have to draw their pension just yet.
I also had a quick rummage through the plate stocks in the cold room, and there are some from last autumn, whilst several stacks are 4 months+. And those are the ones on the front shelves. I'm sure if I look hard enough I'll find some from the last millenium, maybe with weird and wonderful strains of bacteria on them.
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