EGGS KEEPING QUALITY

How should eggs be refrigerated?
Refrigerate raw shell eggs in their cartons on the middle or lower inside shelf, not on the door, and away from any meat that might drip juices or any raw produce that might contact eggshells. Cover or wrap well any egg mixtures or leftover cooked egg dishes. For all perishable foods, including eggs and egg containing dishes, allow no more than 2 hours at room temperature for preparation and serving, 30 minutes to 1 hour when it's 85°F or hotter without refrigeration.

How long are eggs safe to eat after purchase?
Fresh shell eggs can be stored in their cartons in the refrigerator for four to five weeks beyond the carton’s Julian date with minor loss of quality. Once an egg begins to age, it loses moisture through its porous shell and begins to dry. The membranes that hold the egg structure begin to loosen and the yolk may not be anchored in the center of the white once the egg is broken. An older egg would be most appropriate for a mixed dish, a batter or a hard cooked egg which should be easier to peel than a freshly laid egg.

How long are eggs that have been refrigerated, safe to eat?
Raw eggs maintain their freshness for 4-5 weeks after purchase if kept refrigerated continuously.

How long are hard cooked eggs that have been refrigerated, safe to eat?  
A hard cooked egg can safely be refrigerated for up to one week.

How does Salmonella infect eggs?
Salmonella bacteria are found in the intestinal tracts of animals, birds, reptiles, insects and humans. Salmonella may be found on the outside of the egg shell before the egg is washed or it may be found inside the egg if the hen was infected. It is estimated that one egg in 20,000 eggs may contain Salmonella which is a 0.005% contamination rate. Eggs contain natural antimicrobial substances in the egg white, and all eggs are washed and sanitized before they are packed. Egg recipes properly prepared in individual servings and promptly eaten are rarely a problem.  Inadequate refrigeration, improper handling and insufficient cooking are all factors that have contributed to disease outbreaks. Salmonella is destroyed by heat. Eggs that have been handled and cooked properly should not cause human illness.

I just realized I left the egg carton on the kitchen counter overnight. Are the eggs safe to use?
The general rule is that if food items are at room temperature for more than 2 hours, the safest thing to do is to discard the product. If you leave eggs anywhere that is not refrigerated, the best thing to do is throw those eggs away and buy a new carton.

What is an adequate temperature to cook an egg?
Egg white coagulates between 144 and 149°F, egg yolk coagulates between 149 and 158°F and whole eggs between 144 and 158°F. Plain whole eggs without added ingredients are pasteurized but not cooked by bringing them to 140°F and maintaining that temperature for 3 and 1/2 minutes. According to the FDA Food Code, eggs for immediate consumption can be cooked to 145°F for 15 seconds.

If the eggs are to be used in a recipe with other food items, dilute the eggs with liquid or other ingredients, such as milk, or sugar (at least ¼ cup liquid or sugar per egg as in custard) and cook the egg mixture to 160°F, which will destroy harmful bacteria in a few seconds. Adequate cooking brings eggs and other foods to a temperature high enough to destroy bacteria that might be present.

Is the appearance of an egg related to food safety?
Variation in egg color is due to many factors. A cloudy white is a sign that the egg is very fresh. A clear egg white is an indication that the egg is aging. Pink or iridescent egg white indicates spoilage and should not be consumed. A rupture of one or more small blood vessels in the yolk may cause blood spots at the time of ovulation. It does not indicate the egg is unsafe to eat. The color of the yolk varies in shades of yellow depending upon the diet of the hen. If she eats plenty of yellow/orange plants the yolk with be a darker yellow than if she eats white cornmeal, a colorless diet. A green ring on a hard cooked yolk is result of overcooking and is caused by sulfur and iron compounds in the egg reacting on the yolk's surface. The green color can also be caused by a high amount of iron in the cooking water. Scrambled eggs held too long on a steam table or at too high a temperature can also develop a green tint. The green color is safe to eat.