Actually… very interesting….that’s up for debate. 50/50 on in or out of the fridge due to the ketchup going moldy. My cabin can get up to 90 degrees when away seen by camera …. So almost everything except salt and pepper goes in there when away……Everyone knows opened ketchup does not go in the refrig!!
I always put mine in the refrig after opening. GF and her family do not. Interesting.