How to Tell If an Egg Has Gone Bad—3 Foolproof Tests (Plus What “Expired” Really Means)

💡 Why it works: As eggs age, moisture and carbon dioxide escape through the shell’s pores, enlarging the air cell. A floating egg = too much air = potential bacterial growth.

2. The Sniff Test: Your Nose Knows Best

Never skip this one—especially if you’ve already cracked the egg.

Fresh eggs have little to no odor.

Bad eggs smell sulfurous, like rotten eggs (literally!), ammonia, or sour milk.

If you detect any off smell—even faintly—throw it out. Cooking won’t kill all the bacteria, and foodborne illness isn’t worth the risk.

⚠️ Pro tip: Do the sniff test away from your mixing bowl! One bad egg can contaminate your whole batch.

3. The Visual & Texture Check

Once cracked, examine the egg closely:

Yolk: Should be bright yellow or orange, domed, and intact.

White (albumen): Should be thick and gel-like near the yolk, with a thinner outer layer.

Red flags:

Pink, green, or iridescent egg white → bacterial contamination

Watery, spread-out whites → old but not necessarily bad (okay for baking)

Blood spots or meat spots → harmless! Just remove with a spoon if desired.

But What About the “Sell-By” or “Expiration” Date?

Here’s the truth: Eggs are usually good for 3–5 weeks after the pack date—even if the carton says “use by” sooner.

Pack date (a 3-digit number like “045” = Feb 14) = when they were cleaned and boxed.

Sell-by date = for stores, not consumers.

As long as eggs are refrigerated at or below 40°F (4°C), they stay safe well beyond the printed date. Always store them in the main fridge compartment—not the door, where temps fluctuate.

FAQs: Your Egg Safety Questions, Answered

Q: Can I eat eggs after the expiration date?

A: Yes—if they pass the float and sniff tests. Most “expired” eggs are still fine for weeks.

Q: Why do hard-boiled eggs spoil faster?

A: The shell’s protective coating is washed away during boiling. Store peeled or unpeeled hard-boiled eggs for only 7 days in the fridge.

Q: Are brown eggs safer than white?

A: No—color doesn’t affect freshness or safety. It’s just the breed of chicken!

Q: What if an egg cracks in the carton?

A: Use it within 2 days, and cook thoroughly (no runny yolks). Cracks let bacteria in.

Q: Can I freeze eggs?

A: Yes—but not in the shell! Crack into a bowl, beat lightly, and freeze in portions (½ cup = ~2 eggs). Use within 1 year.

When in Doubt, Throw It Out

Eggs are inexpensive, but food poisoning isn’t. If an egg looks, smells, or floats suspiciously—don’t gamble. Toss it, wash your hands, and grab a fresh one.

Because breakfast (or midnight pancakes) should be joyful—not a science experiment.

Got an egg mystery of your own? Share your story below! Did the float test save your frittata? We’re all learning together—one cracked shell at a time. 🥚✨