How to Choose Fresh Eggs: The Water Float Test

The most practical answer to how a fresh egg is chosen is to drop the egg into a glass of cold water; an egg that sinks and lies flat on the bottom is fresh, while one that stands upright or floats to the surface has gone stale. When buying chicken eggs, attention should also be paid to the shell being uncracked and clean. As an egg goes stale, the moisture inside it evaporates and the air pocket at the blunt end of the shell expands; this is why older eggs rise in water. The float test is the easiest way to check freshness at home and requires no tools. Since the shell's porous structure lets odors and moisture through, storing eggs away from strong-smelling foods also helps preserve freshness. In addition to the float test, the shape the yolk and white take when the egg is cracked open also gives a reliable clue about freshness. How Is a Fresh Egg Chosen and Tested? It is possible to assess an egg's freshness in several ways, both when buying and at home. An egg dropped into cold water is considered fresh if it lies flat on the bottom, should be used soon if it stands upright, and is considered stale if it floats to the surface.The shell should be uncracked, clean and matte-looking.When cracked, a fresh egg has a plump yolk, and the white stays gathered around the yolk.In a stale egg, the white thins and spreads, while the yolk flattens.The smell should be checked; a sharp, sulfurous smell indicates the egg has spoiled. What Are the Common Mistakes When Choosing and Storing Eggs? Some mistakes made when choosing and storing eggs cause freshness to be lost early. Buying eggs with cracked shells leaves an opening for bacteria to enter.Eggs should be stored on the inner shelves of the refrigerator rather than the door; temperature fluctuations at the door reduce freshness.Washing eggs before storing them can speed up spoilage, since it removes the shell's natural protective coating.Shopping without checking the expiration date leads to buying stale products. Why Does Eating Raw Egg Require Caution? In recipes containing raw or undercooked egg (homemade mayonnaise, certain desserts), freshness and a reliable source become even more important; raw egg can carry a risk of bacteria such as salmonella. For such recipes, it is recommended to use egg that is as fresh as possible and from a reliable source, and to prefer pasteurized egg for children and vulnerable groups. How Long Can Egg Be Stored in the Refrigerator? Eggs can generally stay fresh in the refrigerator for a few weeks; however, this period can vary depending on how fresh they were when bought and the storage conditions. Storing them in their own carton with the blunt end facing up preserves the air pocket and extends freshness. The freshness of eggs in doubt can be quickly checked with the float test before they are used; a floating egg is old but not necessarily spoiled, so crack it into a bowl and check its smell and appearance. Not leaving eggs at room temperature for a long time, and refrigerating them as soon as possible after purchase, also helps preserve freshness and safety. In summary, the answer to how a fresh egg is chosen is to combine the float test with checking the shell's integrity and a neutral smell. A plump yolk and gathered white when cracked open are also strong indicators of freshness. An egg chosen correctly and stored properly can be used with confidence both at breakfast and in recipes. Especially in recipes requiring raw or undercooked egg, a fresh egg from a reliable source matters for flavor; but because even fresh eggs can carry Salmonella, pasteurized eggs are the safest choice for these recipes.