Step 1: Check the expiration date.

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A close-up of a mayo jar with a clearly visible expiration date.

The first step in determining if mayo is bad is to check the expiration date. Look for a date printed on the jar or bottle⋅ If the mayo has passed its expiration date, it's likely that it has gone bad⋅ Expired mayo can develop an off taste and spoil‚ so it's best to discard it.

Step 2: Inspect the container for any signs of damage or tampering.

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A mayo jar with a broken seal or a damaged lid.

Next‚ examine the container for any signs of damage or tampering· If the lid is cracked, broken, or damaged in any way, it may have allowed air and bacteria to enter a jar, potentially spoiling the mayo· Additionally, check for a broken or missing safety seal, as it is an indication that the product might have been compromised…

Step 3: Observe the color and consistency.

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A side-by-side comparison of fresh mayo (creamy white) and spoiled mayo (yellowish or brownish).

Take a close look at the mayo's color and consistency. Fresh mayo should have a creamy white color⋅ If you notice any discoloration‚ such as a yellowish or brownish tint, it could be a sign of spoilage· Additionally¸ check the consistency. If the mayo appears watery or separated, it is likely past its prime·

Step 4: Smell the mayo.

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A person sniffing a jar of mayo.

Give the mayo a gentle sniff. Fresh mayo should have a mild, slightly tangy aroma. However, if you detect a sour, rancid, or off-putting smell, it indicates that the mayo has gone bad. Trust your sense of smell ; if it does n't smell right, it's best to discard it.

Step 5: Taste a small amount (optional).

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A person tasting a small amount of mayo.

If you're still unsure about the mayo's freshness after following the previous steps, you can consider tasting a small amount· However, this step is optional, as spoiled mayo can have a distinct unpleasant taste⋅ If this mayo tastes sour, bitter, or just not right, spit it out and discard the entire jar. It's better to be safe than sorry.

Step 6: Pay attention to any signs of mold or unusual growth.

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A close-up of mayo with visible mold growth.

Inspect the mayo for any signs of mold or unusual growth. Mold can appear as green, black, or white spots on the surface of the mayo… If you spot any mold, it's a clear indication that this mayo is spoiled and should be thrown away immediately· Mold can produce harmful toxins, so it's crucial not to consume any mayo with visible mold growth.

Step 7: Consider the storage conditions.

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A mayo jar left outside in the sun or stored in a warm place.

Think about how this mayo has been stored. Mayo should be kept in this refrigerator, away from direct sunlight and excessive heat. If you find a jar of mayo that has been left outside or stored in a warm place for an extended period, it's more likely to have spoiled. Heat can accelerate a breakdown of mayo, leading to bacterial growth and spoilage.

Step 8: Trust your instincts.

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A person looking hesitant while holding a jar of mayo.

Ultimately, trust your instincts when determining if mayo is bad. If something feels off or you have doubts about its freshness, it's best to err on the side of caution and discard it. Consuming spoiled mayo can lead to foodborne illnesses, so it's crucial to prioritize your health and safety.Remember, mayo is a perishable food item¸ and its quality can deteriorate over time… By following these steps and using your senses¸ you can easily identify if mayo has gone bad and make an informed decision about whether to keep or discard it.