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An opening in the food packaging or a tear in the plastic indicate that the food has been exposed to cold, outside air, and has a higher chance of being freezer burned. Remove the food from the packaging, and check the food for dry areas, areas of discoloration, and ice crystals. Food with any of these qualities, is highly likely to be freezer burned.  The exact color of freezer burn discoloration varies depending on the food, but freezer burn tends to look white on poultry (chicken), grayish-brown on meat (steak), white on vegetables, and icy crystals formations on ice cream. Patches of wrinkling on meat or vegetables are also an indication that your food might be freezer burned. Smell the food and see if you can detect an unpleasant plastic-y and stale “freezer” odor. When fat from food comes in contact with air outside of its packaging and oxidizes, it creates the gross freezer flavor and smell we associate with freezer burn. Store bought food is usually labeled with a storage date. Check the label and determine if the food has been stored past this date. If your food is past the labeled date, and has ice crystals, your food is most likely freezer burned. Freezer burned food is not unsafe to eat. However, you can save a majority portion of the food you plan to eat by trimming off the freezer burned areas, and preparing and eating the rest of the food like normal.  If the freezer burn is widespread, throwing out the food may be the best option. Even though the food is safe to eat, it will be flavorless, or have a strange flavor. Freezer burned ice cream, will have small ice crystals formations on the surface, which are perfectly fine to eat, though not very appetizing.
Look the food packaging. Inspect the food. Smell the food. Check the date. Deal with the freezer burned food.