Once ketchup is opened, it should be refrigerated. if the cap is closed it doesnt have to be refrigerated
Yes. Overnight if it's been opened and left out for hours and hours it's not going to taste good.
If it's still sealed up, overnight is safe. If it's been opened, I would through it out after a few hours.
Not if you used mayonnaise to make it. Mayo should only be allowed a short time between refrigeration and being eaten.
I've eaten lemon custard left out overnight. It was boxed and the edges hadn't started to skin over. Most custard pies are not refrigerated coming from the manufacturer, but fresh pies and opened boxes really should be refrigerated overnight.
because it is sealed and uncontaminated. once opened, the product has been exposed to bacteria in the air and has begun the spoiling process. (this is why these perishable foods have internal seals under the caps)
There's been a number of consumer tests for condiments such as ketchup, and Heinz is usually well-ranked.
If your house was cool (at least body temp) then it should be OK. If you aren't sure then phone your vet.
No, it is not safe to eat if it has been left out overnight.
no
The term "ketchup," also called "catsup," began in early days as a general term for "sauce." The first actual ketchup recipe using tomatoes dates back to around 1801. Ketchup as we know it today has been around since the early part of the 20th century.
Only if it's been kept in the fridge overnight.
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