To determine the freshness and quality of an egg, there are several methods you can use. One effective way is to examine the egg under a fluorescent light. A fresh egg will appear bright and completely translucent, with a color ranging from orange-red to light-orange. The shell should be clean, without any spots or discoloration. If the egg appears black, it's likely rotten. If it looks cloudy, it may be a "yellow egg" (an unfertilized egg that hasn't developed properly). If there's a dark shadow inside, it could be a "white egg" — an egg that hasn't been fertilized for two or three days. In some cases, you might see blood vessels or clots, which indicate an unfertilized egg that has been incubated for about 10 days.
Visually, a fresh egg should have a slightly rough texture and a thin layer of white, powdery substance on its surface. The shell should appear shiny and have visible pores. If the shell looks gray, has black spots, or feels slimy, it’s likely old or spoiled.
When you hold an egg in your hand, a fresh one will feel heavy and firm, giving a slight pressure when squeezed. If it feels light or hollow, it’s probably not fresh.
Another method is to shake the egg near your ear. A fresh egg will make a solid, muffled sound. If it makes a loud, hollow, or rattling noise, it may be old or bad. A rotten egg might even sound like it's filled with loose particles, similar to knocking on broken stones.
You can also test the egg by placing it in water. A fresh egg will sink to the bottom and rest with the pointed end down. If it floats, it’s likely old. For pickling purposes, you can place the eggs in a 10% saltwater solution. Fresh eggs will sink, while older ones will float slightly. Bad eggs will float to the top.
These methods are commonly used to assess egg quality and ensure food safety. Always trust your senses — sight, touch, sound, and even smell — to determine if an egg is safe to eat.
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