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Originally Posted by ubertuber
I promise you that leaving it at room temperature won't make it go bad. I actually buy bottles and open them and let them age - I seriously own about 3-5 bottles of ketchup at any time. I think it tastes better. I could be wrong, but I've never gotten sick from eating ketchup that was stored at room temperature for 9 months+.
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It will go rancid unless you use it fast enough. I don't think there's enough vinegar to keep it "preserved" forever (like pickled eggs and cucumbers).