Is it safe to eat un opened salad dressing that has been refrigerated but now left out for several days?
Is it safe to eat salad dressing straight from the super market shelf or should it be refrigerated first?
Yes, it is safe to eat salad dressing that was from the super market shelf without refrigerating it first. These bottles are packaged so that they are shelf stable up until their "use by" or "best before" date as long as they remain unopened. Once they have been opened, they should be stored in the refrigerator because that seal has been broken and now microbes and mold can start to grow. However, if you purchase…
It is impossible to say. Some dressing will go bad more quickly than others. If kept refrigerated, a vinegar and oil dressing should last for several years, while an unrefrigerated blue cheese dressing could go bad in a matter of a few months if it remains sealed. An unsealed bottle of dressing could go bad in a matter of hours at room temperature.
Yes. After a few hours at room temperature, it can become rancid. Real mayonnaise, made with eggs, can become toxic after a few hours because eggs can easily be contaminated with salmonella bacteria. So be sure to make the potato salad for the picnic the morning of the event rather than the week before.