2. The Sniff Test
The most ancient and reliable method is simply your nose. A spoiled egg will have a very distinct, pungent sulfur odor. If you are unsure, crack the egg into a clean white bowl. If there is any smell at all, throw it away and wash the bowl thoroughly. A fresh egg should have a completely neutral scent.
3. The Visual “Plate” Test
Crack the egg onto a flat plate or into a bowl and observe the yolk and the white (albumen).
- Fresh: The yolk is bright yellow/orange and stands tall and round. The white is thick and stays close to the yolk.
- Older: The yolk is flatter and breaks easily. The white is thin, watery, and spreads across the plate.
4. The Shake Test
Hold an egg up to your ear and give it a gentle shake.
- Fresh: You should hear absolutely nothing.
- Old: You will hear a “sloshing” sound. This happens because the air pocket has grown and the moisture has evaporated, giving the contents room to move around inside the shell.
5. The Candling Method (Professional Style)
This is a technique used by farmers to grade eggs. In a dark room, hold a bright light source (like a powerful flashlight or your phone’s LED) against the large end of the egg.
- In a fresh egg, you will see a very small air cell (less than 1/8th of an inch deep).
- As the egg ages, you will see a much darker, larger shadow where the air pocket has expanded.
