|From left: Very Fresh • Pretty Fresh • Bad • Cat|
When you’re wondering about the age of an egg, put it in glass of water.
Really fresh eggs lie on the bottom the glass, flat. These are the eggs you want for poaching and other dishes where the egg is the star.
If one end bobs up a bit, as does the middle egg above, the egg is older, but still good. The upward tilt can be more extreme than it is in this picture. In fact, the egg can even stand up straight, just so long as it is still sitting on the bottom of the glass. The egg in picture above is just a tiny bit past absolutely fresh, but still very suitable for egg dishes. If it were standing up a little more, I’d use it for baking or hard boiling. Indeed, older eggs are best for hard boiling, because fresh eggs are impossible to peel.
What you don’t want to see is a floating egg. A floating egg is a bad egg. (Like a witch!) Old eggs float because the mass inside the egg decreases–dries out–over time, making it lighter. I personally don’t trust any floating egg, but I do know that other people draw a distinction between eggs that float low and eggs that float high, and only discard the high floaters. And I honor their courage.