1. If eggs are past their expiration date on the package, they may not be fresh anymore. 2. Sniff the egg; if anything smells off, you should toss it. If the egg in shell gives off no odor, crack it open and give it another sniff. Again, if anything smells off, you should throw it away. 3. Check the shell for any cracks, sliminess, or powder. If you notice any of those things, then the egg is probably bad. 4. If the shell is clear, crack the egg into a bowl and check for any pink, green, blue, or black discoloration. If you notice any, toss the egg. 5. Do a “float test.” Gently place the egg in a bowl of water. If it sinks, it’s fresh; if it tilts upward or floats, it’s gone bad. 6. Shake the egg by your ear. If you hear a sloshing sound, then it has most likely gone bad. 7. Try egg candling. Take the egg into a dark room with a light source such as a flashlight. Hold the light up to the large end of the egg, then tilt the egg and rotate it quickly from left to right. This should illuminate the contents of the egg, which should allow you to examine the egg’s air cell. In a fresh egg, the air cell should be thinner than ⅛ inch. If it’s thicker than that, the egg has most likely gone bad.