You’ll know which eggs are fresh to use before you’ve cracked them with this simple trick.
 
Firstly look at the shell of the egg; fresh shells are rough and chalky whereas older eggshells are smooth and shiny. To be sure take the egg and place it into a bowl or cup of water – fresh eggs will sink to the bottom but eggs that are starting to spoil will float. This is because when the contents of the egg spoils and begins to breakdown it produces gas – the trapped gas causes the egg to float.