which hen laid this egg

I have just bought food dye to put on 2 of my hen's vents to see which eggs were leyed by them. My question is when do I put it on them? In the evening when they go roost, so they could lay in the morning? But wouldn't the dye dry or disappear overnight? Maybe in the morning before they lay, but...

So, my ladies are laying!!! I've done so much reading and research trying to figure out who is laying what egg, I think I've driven myself into more confusion than I was before.... now I'm not even sure what breed I have. So we will start with Phoebe, I know that she is a Buff Orpington. She...

Yesterday, while I had the misfortune of working away from home, one of my baby chicks layed an egg. :hit They grow up so fast, don’t they? I wasn’t quite expecting an egg at exactly 18 weeks. But lo and behold, last night when I got home I immediately went out to their house to do a quick head...