Although it is advisable to refrigerate after opening, I never do so,
..... and I always have a bottle of ketchup in use.
The ingredients in ketchup include adequate levels of salt, sugar and vinegar to preserve the other ingredients that might otherwise go off.
I have never been made ill by ketchup that has gone off, even though I have often used it when it has been out on a table or in a cupboard for several weeks, after opening, even during the middle of summer.
However, I am aware that my digestive system is rather more robust than most people seem to be blessed with.
Refrigeration of opened bottles of ketchup is sound "common sense", but in my opinion, it would be silly and needlessly wasteful to throw it away if it had been inadvertently left out at room temperature for a few days.
Best wishes - Majikthise.
Depends on the ketchup actually.
On the amount of preservative agents your brand of ketchup as well as on the percentage of sugars in your brand of ketchup.
There are "health" ketchups made of tomato pulp, and some spices. I'd refrigerate that.
There are "common" ketchups, made of sugar, concentrated-tomato-pulp-replacement-substance, sweetener, preservative agents, food color, more preservative agents, flavor enhancers, emulsifying agents, several other dubious ingredients and spices. That ketchup is probably so dead that no sane bacteria will ever think about even touching it. It would be a total waste of energy to refrigerate that.
I've just had a butchers on the back of my Daddies bottle and it says to stick it in the fridge after you've opened it and scoff it within 8 weeks.
Saying that, this bottle of red sauce was bought in summer last year and doesn't know the meaning of the word fridge and it's still nice and red and tasty.
Refridgerate. However, restaurants leave it out on the tables all the time but it's getting used up faster. I don't think ketchup is a high risk item for bacteria growth as long as the lid is kept on.
Yes if its open you have to keep it in the refrigerator. If its still sealed you can keep it in a pantry, out in the kitchen or cupboard.
refridgerate im sure. If its un opened then you can store in cupboard