A method of marking an egg is disclosed and comprises applying radiant energy to the shell of an egg so as to cause discoloration of the eggshell, thereby forming a marking comprising at least a traceability code and a freshness date. Apparatus is also disclosed for applying markings on eggs being processed by an egg-handling machine that is designed and configured to transport a plurality of eggs therethrough, wherein the apparatus comprises a radiant energy source located in proximity to the egg-handling machine, the radiant energy source being configured to apply radiant energy to the eggs as the eggs are transported past the radiant energy source to selectively discolor the shell of the eggs and form markings on the shell, including a freshness date and a traceability code.