What Next: Numbered Eggs

This NYTimes article is on a problem with tainted eggs in Europe (pesticide contaminated egg-washing solution).  Among the steps taken:

The Dutch consumer safety authority has published a guide on identifying the tainted eggs through a 10-digit serial number stamped on the shells.

 Unfortunately I was never much good at languages so I can't read the Dutch.  I can sort of see how, if we have machinery which can roll a sticker onto an orange or apple we could also develop machinery which might print a number on the egg with ink that wouldn't penetrate the shell.  Presumably the number is a farm number, not the number of the hen.