The most reliable way to tell if milk has gone bad is by smelling it. Spoiled milk will have a distinctly sour or rancid odor that is hard to miss.
Other signs that milk is bad include:
- A change in color: Milk that has gone bad may appear yellowy or have a cloudy consistency.
- Lumps or curds: The presence of clumps or curds in the milk indicates spoilage.
- A crust forming around the edges: This is another sign that the milk has begun to spoil.
It's important to note that milk doesn't suddenly go bad. The spoilage process is gradual and the smell and appearance will change over time. If you're unsure about the milk's freshness, it's always best to err on the side of caution and discard it.
