I see tones of pictures where people have the eggs of cresties of other reps with writing on them.. is this just to keep track of where the eggs came from or is there some other reason?
i write on the eggs to make sure they are not turned somewhat in incubation. if they get turned the babies will die. also you can mark them with number to state different clutches or different mothers or whatever.
I just use different colored markers to put dots on top. Each female ( Leo I don't have a female crestie yet) has a specific color that I use. The dot is on top so I know which side needs to stay up.