They will sink and stay horizontal on the bottom of a glass of water. The egg white is viscous and close around the plump yolk. The egg white is runnier in an egg approx. 7 days old. They will stand upright about midway in a glass of water.
Old eggs are smooth and shiny.
They will float in a glass of water. The egg white is watery and the yolk is flat in an egg roughly 3 weeks old. Egg whites can be frozen for up to one year. They can be refrozen after defrosting also. Cover generously with salt.