I'm soon going to start collecting eggs to be shipped out. These eggs need to be marked with dates. I don't mark my eating/hatching eggs, but I'm not concerned about hatch rates on personal eggs, so I don't mind using older eggs with unknown dates. Anyways, I need to know if I can mark them with black permanent marker. Will it mess the eggs up? These are quail eggs, so a pencil certainly won't work.
