Beef gets much of its color from myoglobin, a protein that changes appearance depending on oxygen exposure.

Vacuum-packed beef may look purplish and still be fresh; oxygen can turn its surface cherry red. Neither shade establishes safety.

Lighting and packaging can also influence what catches your eye. At the store, read storage instructions, check package dates without treating them as guarantees,

and avoid leaking, damaged, or swollen packs. Choose meat that is properly refrigerated.

Once home, refrigerate meat promptly at 40°F (4°C) or below. An unpleasant odor or slimy surface can warn of spoilage,

but harmful bacteria may cause no noticeable changes. Never taste meat to test it.

Keep raw juices away from ready-to-eat foods, and use a food thermometer:

whole beef steaks need 145°F (63°C) followed by a three-minute rest; ground beef needs 160°F (71°C). Protecting dinner takes more than a glance—it takes careful handling from checkout to plate.