Want to know which eggs in the fridge are raw and which have been hard-boiled? If you spin one on the counter, the hard-boiled egg will spin smoothly and quickly, rather like a top. The raw egg, on the other hand, will wobble and spin more clumsily. The reason for this difference is that the inside of the hard-boiled egg is solid, so it all moves together as one entity. The inside of the raw egg, of course, is a liquid blend of yolk and egg white, which are all swirling at the same time. Because the yolk and egg white have different densities, the raw egg will wobble in a decidedly side-to-side, uneven motion.
What to look for in an egg:
The color of an egg’s yolk is determined by a hen’s diet. The more grain a hen eats, the more vibrant the color of the yolks in the eggs she lays.
Egg whites that are cloudy indicate that the egg is very fresh. Clear egg whites indicate that the egg is aging.
The blood sometimes seen in an egg comes from the rupture of small blood vessels in the yolk. It does not mean that the egg is unsafe to eat.