Afraid to crack that egg?

We've all done it.  You are digging in the fridge and find a mysterious carton of eggs.  How long has that been there?  Are they still good?  Do I dare crack one to find out?  Never fear!  Here's a sure fire way to tell how old those eggs are!  

With all of the chickens running around at Mom's, we sometimes have a surplus of eggs and lose track of what order they were collected in! When that happens we pull out a bowl or glass of water and give the eggs a little bath.  If they float we know they are old and need tossed, if they sink we know they are nice and fresh!

Just like this...

 The brown egg just happens to be really old, so it floats like a cork.  The white egg is fresh so it sinks all the way to the bottom.

So what exactly is going on here?  Well egg shells aren't as solid as we tend to think.  They are actually porous to allow gas exchange in case there is a chick growing inside.  Over time the dense liquid inside the egg can evaporate and shrink, allowing more air to displace the space left behind.  Eventually the egg is so much lighter that it floats when placed in water!  Obviously this doesn't happen all at once so there is a gradient of where the egg stays once placed in the water.  The freshest eggs lay right on the bottom, the oldest float to the top, and those in between - well, they settle somewhere in between the top and bottom.

Surfing around on the web you will find lots of opinions about what to do with the "floaters".  Some say toss them, some say that as long as they were stored at an appropriate temperature you can use them for boiled eggs - here at the farm we like to play it safe and toss all the ones that float.  We also try to use only the freshest eggs in things we might consume raw (like cookie dough!).

So next time you encounter those 'mystery eggs' confront them confidently with a bowl of water and you will never be surprised by that awful sulfur smell again!


Please note: I am not a medical professional   Common sense should dictate your decisions about your food.  If there is any question in your mind about food's safety please throw it out!