eli5 Eggs in the supermarket state on the box “Double Yolk”. Without cracking them, how do they know….?

Question

Apologies if this is ridiculous and should be in no stupid questions but it just struck me

In: 2748

Answer 1

You can tell too with a flashlight in a dark room. Essentially this process is automated. Pretty much only come from new layers so they also know where to be looking.