Margarine can expire and usually has a date on the label that indicates the last day for its use. Margarine can be used for about two weeks beyond that date. To keep margarine fresh, it should be placed in a refrigerator after every use.
When margarine goes bad, it has a rancid taste that indicates the product should be discarded. Spoiled margarine is unsafe for consumption because its polyunsaturated fats can form harmful free radicals in the body. Many common foods are safe to use beyond the date on the label if they are stored in an appropriately cold refrigerator.Learn More
Popcorn kernels do not expire in the sense that old popcorn can make you sick, but popcorn can dry out which causes the popcorn to no longer pop. Microwave popcorn sold in stores has a best-by-date on the box.Full Answer >
Vinegar has an almost indefinite shelf life when it is stored properly. Vinegar is self-preserving due to its acid content and does not expire. While vinegar may change color or develop a haze over time, it is still good and can still be consumed.Full Answer >
The shelf life of shortening depends on the type of product that it is, but shortening does expire; for example unopened cans and shortening sticks have a shelf life that is about 2 years from the manufacturing date, while an opened can of shortening will last about a year, but shortening sticks will only last about 6 months. Key indicators of shortening are color, smell and taste. If any of these are off, the shortening has likely gone bad and should be discarded.Full Answer >
Pure vanilla extract has an indefinite shelf life, while imitation vanilla extract can be stored for two to four years. Because these items are labeled with a "best by" date and not a "use by" date, any issue with shelf life of these products deals with quality and not safety.Full Answer >