I presume the same thing, water-based will be absorbed by the shell more than the permanent would. Testing it would be easy enough. I caved and just bought
these though.
I mark each egg of a batch with an X, an O, or //. I thought how much easier just to put a different colored dot on each one. I.e., one batch of say two dozen will have a red dot on each egg, then the next batch a purple dot, etc.
I stagger hatch so eggs from five days earlier or five days later could be in the same tray. I don't want to have to necessarily candle them to determine which ones go to lockdown or if I have to rearrange them for some reason.