Huh. Ketchup bottles have always told you to keep them refrigerated as far back as I can remember (across decades, in the US and the UK) and I have always disob

Huh. Ketchup bottles have always told you to keep them refrigerated as far back as I can remember (across decades, in the US and the UK) and I have always disobeyed. I have never, ever known ketchup to spoil. I just checked and none of the ketchup in the house now (several brands) have any "chemical" preservatives. But they do contain lots of vinegar. I am sure that the delivery mechanism of squeezy bottles helps prevent infection as well.