Warning signs Discoloration, sour smell, or a rancid taste.
How to check Look for color change, smell for off-odors, and taste a small amount for rancidity.
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How do I tell if butter & margarine has gone bad?
The warning signs are discoloration, a sour smell, or a rancid taste. Look for any color change, smell for off-odors, and taste a small amount to check for rancidity.
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