Does unopened salad dressing go bad?

Yes, unopened salad dressing can go bad, but it usually has a longer shelf life than opened dressing. Here's a breakdown:

Factors affecting shelf life:

* Type of Dressing: Oil-based dressings (like Italian or vinaigrette) tend to last longer than creamy dressings (like ranch or blue cheese) due to the preservatives in oil.

* Ingredients: Dressings with natural ingredients (like fresh herbs) will have a shorter shelf life than those with more processed ingredients.

* Storage: Proper storage (cool, dark place) is crucial for extending the shelf life.

General Guidelines:

* Oil-based: 1-2 years

* Creamy: 6-12 months

Signs of Spoilage:

* Off odor: A sour or rancid smell.

* Color change: Discoloration or separation.

* Texture change: Thickening or becoming watery.

Tips:

* Check the expiration date: Always look for the "best by" or "use by" date on the bottle.

* Store properly: Keep unopened salad dressing in a cool, dark place.

* Refrigerate after opening: Opened salad dressing should be refrigerated and consumed within a few weeks.

If in doubt, throw it out! It's always better to err on the side of caution when it comes to food safety.