Butter lasts longer than many dairy products, but it can still spoil over time, especially after being opened.
How to tell if butter has spoiled
Butter is spoiled if it smells rancid, tastes bitter, or develops mold.
Signs butter is no longer safe
Fresh butter has a mild, creamy smell. When fats oxidize, the smell and taste change noticeably.
- Sharp, sour, or paint-like odor
- Bitter or unpleasant taste
- Mold spots on the surface
Does color change mean butter is bad
Butter may darken slightly when exposed to air, but strong smell or bitter taste indicates spoilage.
Moldy butter should always be discarded entirely.
Common butter storage mistakes
- Leaving butter uncovered.
- Storing butter near strong-smelling foods.
- Keeping butter at room temperature too long.
Conclusion
If butter smells rancid or tastes bitter, it should not be eaten.