You'll notice off flavors, off odors, and it may become a darker color," explains Kimberly Baker, Food Systems and Safety Program team director at Clemson University... Stale odors, like wet cardboard or paint thinner, may indicate your almond milk has gone rancid... If you're unsure, Baker says it's okay to give it a small sip; if it has a sour taste or is otherwise unpleasant to drink, you know what to do.
The consistency of your almond milk can also be an indicator of spoilage. The introduction of bacteria or yeast (think fermentation) can cause the milk to thicken or curdle... Some separation in almond milk is natural, notes Baker. It's good practice.
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