Fresh eggs have small, rounded, centralised egg yolks and thick, gel-like egg whites. On the contrary, stale eggs have large, flat egg yolks and watery, thin egg whites with stale odour and flavour.
The Freshness Test...
At the blunt end of an egg is an air cell. Fresh eggs have small air cells. As the egg ages, the air cell gets larger. Try holding an egg against a bright light in a dark room to see the air cell.
Another way to test the freshness of an egg is to place it in a basin or water. As fresh eggs have small air cells, they will sink to the bottom of the bowl. However, stale eggs will float because of the large air cells.
The egg yolk of a fresh egg is small and in the center of the egg. Aged egg yolks moves off the center.
